OPENNLP-1590 Clear open TODO in GenericFactoryTest

[mawiesne]

Change

• adjusts DictionaryFeatureGeneratorFactory to handle situations without a ResourceManager instance at runtime
• fixes a missing Exception type in catch block of GeneratorFactory#buildGenerator which wasn't handled correctly
• clears TODO in GeneratorFactoryTest
• adds another test case to demonstrate that a descriptively declared dictionary is loaded for the creation of a DictionaryFeatureGeneratorFactory
• adds a related test resource

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