Refactor to remove the nested if statement and correct the usage of assertThat

...aws/security/AuthorizationServiceForServiceAdminImpl.java

...up/osdu/schema/provider/aws/models/SchemaInfoDocTest.java

...rsion/handler/common/AdditionalPropertiesHandlerTest.java

...sion/handler/common/CompositionPropertiesHandlerTest.java

...version/handler/common/ReferenceAttributeHandlerTest.java

...on/version/handler/common/RemoveOperationHandlerTest.java

.../version/handler/common/RequiredAttributeHandlerTest.java

...tion/version/handler/common/TypeOperationHandlerTest.java

...ation/version/handler/patch/SkipAttributeHandlerTest.java