MUMUP-1396: Search placeholder removed when field in focus

In focus: 
![image](https://cloud.githubusercontent.com/assets/1919535/5361762/72a735da-7f93-11e4-994e-4c28be4706aa.png)

Not in focus:
![image](https://cloud.githubusercontent.com/assets/1919535/5361764/7ac5a6d4-7f93-11e4-90cf-4035855c7420.png)

https://www.youtube.com/watch?v=GjjZGyYcH9E