UselessCallOnNotNull: fix false positive for unresolved types #4880
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Fix an issue where UselessCallOnNotNull would report issues when some of the argument types resolved as ErrorType. While it correctly handles cases where the BindingContext cannot resolve a type (the first test case), in cases where a call is made on an unknown type (the second test case, e.g. via takeIf{}) the BindingContext will report it as an ErrorType. Since ErrorType.isNullable() apparently returns false we need to make an exception to ensure the rule behaves as expected.