Nullable compatibility (#882)

* nullable compat

* undo last nullable check

* nullable compat

Author: HeyImChris

React/Base/RCTJSInvokerModule.h

@@ -12,6 +12,6 @@
 @protocol RCTJSInvokerModule
 
 @property (nonatomic, copy, nonnull) void (^invokeJS)(NSString * _Nullable module, NSString * _Nullable method, NSArray * _Nullable args); // TODO(macOS GH#774)
-@property (nonatomic, copy) void (^invokeJSWithModuleDotMethod)(NSString *moduleDotMethod, NSArray *args);
+@property (nonatomic, copy) void (^invokeJSWithModuleDotMethod)(NSString * _Nullable moduleDotMethod, NSArray * _Nullable args);
 
 @end