Prevented an NPE from being thrown inside the creation of another Exception being built to be thrown.
Updated the Error string being searched for since the abstraction that was adding the non-specific message was removed.
Fixed the AbstractXslTransformTest.shouldReturnPoolWithDefaultMinSizeOfOne() test that was causing an infinite loop with the new Apache Commons Pools due to the Mock'd Tansformer not implementing the newTransformer() method.
Updated the AbstractXslTransformTest.shouldThrowExceptionIfXslTransformerCanNotBeGenerated() to actually test the new Apache Commons Pools implementation.