Make optional fields optional in `MappingGenericProperty` (#703) #1670

Job	Run time
integration-test-compatibility (true, 1.1.0)	1m 40s
integration-test-compatibility (true, 1.2.0)	1m 43s
integration-test-compatibility (true, 1.2.1)	1m 42s
integration-test-compatibility (true, 1.2.2)	1m 40s
integration-test-compatibility (true, 1.2.3)	1m 40s
integration-test-compatibility (true, 1.2.4)	1m 43s
integration-test-compatibility (true, 1.3.0)	1m 42s
integration-test-compatibility (true, 1.3.1)	1m 44s
integration-test-compatibility (true, 1.3.2)	1m 41s
integration-test-compatibility (true, 1.3.3)	1m 45s
integration-test-compatibility (true, 2.0.0)	1m 42s
integration-test-compatibility (true, 2.0.1)	1m 46s
integration-test-compatibility (false, 1.1.0)	1m 48s
integration-test-compatibility (false, 1.2.0)	2m 1s
integration-test-compatibility (false, 1.2.1)	1m 52s
integration-test-compatibility (false, 1.2.2)	1m 51s
integration-test-compatibility (false, 1.2.3)	1m 48s
integration-test-compatibility (false, 1.2.4)	1m 51s
integration-test-compatibility (false, 1.3.0)	1m 51s
integration-test-compatibility (false, 1.3.1)	1m 49s
integration-test-compatibility (false, 1.3.2)	1m 54s
integration-test-compatibility (false, 1.3.3)	1m 54s
integration-test-compatibility (false, 2.0.0)	1m 51s
integration-test-compatibility (false, 2.0.1)	1m 52s
	42m 50s

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