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Sakari Tuominen 85d2086321 Fix a bug, if clipData is null we can not ask getItemCount() from it

Summary:
I ran into problems when using Clipboard.getString() in Android. The method seems to work fine when there is *something* in the clipboard, but when it's empty the app crashes. I think I've tracked down the bug to ClipboardModule.java@58.

When clipData is null, the promise is resolved with an empty string. However, after that the rest of the block is executed. There should be a return or an 'else if' like in my pr.

Screenshot of the error message when clipboard is empty:

![image](https://cloud.githubusercontent.com/assets/7509183/15206922/44bd2094-182b-11e6-9400-6a59c513de24.png)
Closes https://github.com/facebook/react-native/pull/7527

Differential Revision: D3292232

fbshipit-source-id: d2191286c49ee31233203fab4648449964b9d950

2016-05-12 01:45:21 -07:00