zendesk/samson — pull request #87 by pswadi-zendesk (2014-09-01 01:11:38+00:00)
Title: Fixed #86. Check for empty mail and return 'default' gravatar url

Nil email would cause an error. Now checking for blank email. Added test cases for gravatar url.
/cc @zendesk/samson

### References
#86

### Risks
- None