bloodhound minLength:0 GET fix

when the typeahead control is instantiated and the field has a value the GET occurs. 
if the field does not have a value (thus blank/""), the GET does not occur.
this commit fixes that behavior such that results are requested and displayed.

before:
![image](https://cloud.githubusercontent.com/assets/906846/3575018/412579aa-0b84-11e4-9c10-5ceaa9cb37d0.png)

after:
![image](https://cloud.githubusercontent.com/assets/906846/3575030/46c37092-0b84-11e4-806e-a21e440d3edc.png)