Extended existing test slightly for xsd errors (#294)

For future changes, where we might want to filter out the first one, or group based on location. It's also the original test case.

source/imaer-gml/src/test/java/nl/overheid/aerius/gml/GMLValidateErrorsTest.java

@@ -93,6 +93,9 @@ void testGMLGeometryNotPermitted() throws IOException {
   @Test
   void testGMLMultipleErrors() throws IOException, AeriusException {
     final List<String> expectedErrors = List.of(
+        "None",
+        "cvc-datatype-valid.1.2.1: 'None' is not a valid value for 'double'.",
+        "cvc-type.3.1.3: The value 'None' of element 'imaer:vehiclesPerTimeUnit' is not valid.",
         "cvc-enumeration-valid: Value 'None' is not facet-valid with respect to enumeration '[HOUR, DAY, MONTH, YEAR]'. It must be a value from the enumeration.",
         "cvc-type.3.1.3: The value 'None' of element 'imaer:timeUnit' is not valid.",
         "cvc-complex-type.2.4.b: The content of element 'imaer:CustomVehicle' is not complete. One of '{\"http://imaer.aerius.nl/5.1\":emission}' is expected.",

source/imaer-gml/src/test/resources/gml/latest/validate/errors/fout_multiple_errors.gml

@@ -30,7 +30,7 @@
             </imaer:geometry>
             <imaer:vehicles>
                 <imaer:CustomVehicle>
-                    <imaer:vehiclesPerTimeUnit>3</imaer:vehiclesPerTimeUnit>
+                    <imaer:vehiclesPerTimeUnit>None</imaer:vehiclesPerTimeUnit>
                     <imaer:timeUnit>None</imaer:timeUnit>
                     <imaer:description>None</imaer:description>
                 </imaer:CustomVehicle>