JBIDE-15084 - Failed to build JAX-RS Metamodel when re-opening a closed project

Catching IllegalArgumentException when JDT fails to retrieve return type from MethodBinding
Added 2 JUnit tests to verify that build does not fail
In case of build failure, the JAX-RS metamodel has a build status set to ERROR, otherwise it is set to OK. This
state can be asserted from the JUnit tests.