Adds an empty test case to the test case controller and nullifies the test cases controller data source on category delete.
Formatting changes
Added static method for generating a blank test case; For some reason passing [[TREXTestCase alloc] init] would crash the app because of a nil string...
Merge branch 'develop' of github.com:joshpc/Testosaurus into bugfixes/delete-category-child-persistence1
Removed static case and changed to alloc init.
Merge pull request #33 from joshpc/bugfixes/delete-category-child-persistence

Adds an empty test case to the test case controller and nullifies the te...