Cannot create project using project-creator role

[reckart]

Describe the bug
It is not possible to create a project as a user having only the USER and PROJECT_CREATOR roles using the New project button. It works when selecting a project template from the dropdown though.

To Reproduce
Steps to reproduce the behavior:

1. Go to the project overview page
2. Click on New project...
3. See error

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots

Caused by: org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: de.tudarmstadt.ukp.clarin.webanno.model.Project
        at org.hibernate.engine.internal.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:347) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.type.EntityType.getIdentifier(EntityType.java:508) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.type.EntityType.nullSafeSet(EntityType.java:289) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:53) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:682) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.bindPreparedStatement(Loader.java:2150) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:2127) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2059) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2037) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.doQuery(Loader.java:956) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:357) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.doList(Loader.java:2868) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.doList(Loader.java:2850) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2682) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.Loader.list(Loader.java:2677) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:540) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:400) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:218) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1459) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1649) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1617) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at org.hibernate.query.internal.AbstractProducedQuery.getSingleResult(AbstractProducedQuery.java:1665) ~[hibernate-core-5.6.15.Final.jar!/:5.6.15.Final]
        at de.tudarmstadt.ukp.clarin.webanno.project.ProjectServiceImpl.hasRole(ProjectServiceImpl.java:397) ~[inception-project-27.5.jar!/:?]
        at de.tudarmstadt.ukp.clarin.webanno.project.ProjectServiceImpl.hasRole(ProjectServiceImpl.java:373) ~[inception-project-27.5.jar!/:?]
        at de.tudarmstadt.ukp.clarin.webanno.project.ProjectServiceImpl$$FastClassBySpringCGLIB$$87162b14.invoke(<generated>) ~[inception-project-27.5.jar!/:?]
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218) ~[spring-core-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:793) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123) ~[spring-tx-5.3.27.jar!/:5.3.27]
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388) ~[spring-tx-5.3.27.jar!/:5.3.27]
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119) ~[spring-tx-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:763) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:708) ~[spring-aop-5.3.27.jar!/:5.3.27]
        at de.tudarmstadt.ukp.clarin.webanno.project.ProjectServiceImpl$$EnhancerBySpringCGLIB$$692f45e3.hasRole(<generated>) ~[inception-project-27.5.jar!/:?]
        at jdk.internal.reflect.GeneratedMethodAccessor251.invoke(Unknown Source) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
        at org.apache.wicket.proxy.jdk.JdkProxyFactory$JdkHandler.invoke(JdkProxyFactory.java:172) ~[wicket-ioc-9.12.0.jar!/:9.12.0]
        at com.sun.proxy.$Proxy255.hasRole(Unknown Source) ~[?:?]
        at de.tudarmstadt.ukp.inception.ui.core.menubar.MenuBar.isMenubarVisibleToCurrentUser(MenuBar.java:165) ~[inception-ui-dashboard-27.5.jar!/:?]
        at de.tudarmstadt.ukp.clarin.webanno.support.lambda.LambdaBehavior$9.onConfigure(LambdaBehavior.java:162) ~[inception-support-27.5.jar!/:?]
        at org.apache.wicket.Component.configure(Component.java:1003) ~[wicket-core-9.12.0.jar!/:9.12.0]
        at org.apache.wicket.Component.beforeRender(Component.java:938) ~[wicket-core-9.12.0.jar!/:9.12.0]
        at org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1759) ~[wicket-core-9.12.0.jar!/:9.12.0]
        ... 104 more

Please complete the following information:

• Version and build ID: 27.5