Avoid potential NPE when collecting RESTEasy Providers on Resource classes

[geoand]

Addresses: #14418 (comment)

[quarkus-bot]

This workflow status is outdated as a new workflow run has been triggered.

Failing Jobs - Building e104aa1

Status	Name	Step	Failures	Logs	Raw logs
✖	Gradle Tests - JDK 11 Windows	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 11
✖	JVM Tests - JDK 17	Build	Failures	Logs	Raw logs

Full information is available in the Build summary check run.

Failures

⚙️ Gradle Tests - JDK 11 Windows #

- Failing: integration-tests/gradle 

📦 integration-tests/gradle

✖ io.quarkus.gradle.devmode.JandexMultiModuleProjectDevModeTest.main line 21 - More details - Source on GitHub

org.awaitility.core.ConditionTimeoutException: Condition with lambda expression in io.quarkus.test.devmode.util.DevModeTestUtils that uses java.util.function.Supplier, java.util.function.Supplierjava.util.concurrent.atomic.AtomicReference, java.util.concurrent.atomic.AtomicReferencejava.lang.String, java.lang.Stringboolean was not fulfilled within 1 minutes.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:164)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)

---

⚙️ JVM Tests - JDK 17 #

- Failing: extensions/resteasy-classic/rest-client/deployment 
! Skipped: extensions/keycloak-admin-client/deployment extensions/keycloak-authorization/deployment extensions/liquibase-mongodb/deployment and 71 more

📦 extensions/resteasy-classic/rest-client/deployment

✖ io.quarkus.restclient.configuration.UnknownConfigTest. line 29 - More details - Source on GitHub

org.opentest4j.AssertionFailedError: Expected 0 warnings ==> expected: <0> but was: <1>
	at org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:55)
	at org.junit.jupiter.api.AssertionUtils.failNotEqual(AssertionUtils.java:62)

[gsmet]

Really, it wasn't necessary to ask another CI run.

[geoand]

Yeah, I just wanted to be sure. But we likely have a flaky test

[gsmet]

Yeah the io.quarkus.restclient.configuration.UnknownConfigTest has been flaky for a while. I pinged @radcortez and @michalszynkiewicz about it already.
And the Gradle stuff has also been a pain lately.

[radcortez]

Yeah the io.quarkus.restclient.configuration.UnknownConfigTest has been flaky for a while. I pinged @radcortez and @michalszynkiewicz about it already.

Sorry, forgot about it. #23037 should do the trick.

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