Fixed JS crash on Android when requiring a native module that doesn't exist

Summary:
public

NativeModule getters call the nativeRequireModuleConfig function to lazily load a module if it's not already available, but this crashes on Android since the nativeRequireModuleConfig hook hasn't been implemented yet. This diff checks that the hook exists before calling it.

Reviewed By: gsaraf

Differential Revision: D2744080

fb-gh-sync-id: cae9c8c45a4d3c80ceb8c10f3d4d59a8d9d3c7f8

Author: nicklockwood

Libraries/BatchedBridge/BatchedBridgedModules/NativeModules.js

@@ -44,7 +44,7 @@ Object.keys(RemoteModules).forEach((moduleName) => {
     enumerable: true, 
     get: () => {
       let module = RemoteModules[moduleName];
-      if (module && module.moduleID) {
+      if (module && module.moduleID && global.nativeRequireModuleConfig) {
         const json = global.nativeRequireModuleConfig(moduleName);
         const config = json && JSON.parse(json);
         module = config && BatchedBridge.processModuleConfig(config, module.moduleID);