Patch for /trunk/html/mobwrite_core.js

```
Fix for changed flag in the case when shadowText = clientText = ""
```

Original issue reported on code.google.com by `grigory.kalabin` on 20 Mar 2014 at 11:03

Attachments:
- [mobwrite_core.js.patch](https://storage.googleapis.com/google-code-attachments/google-mobwrite/issue-1/comment-0/mobwrite_core.js.patch)
