Fix updateConfigTheme method.

No Issue
- Fix exception being thrown when updateConfigTheme called before
  settingsCache fully populated.
- Remove unnecessary check in a conditional in the migration command
  builder.

Example:
![screen shot 2014-11-20 at 8 42 54 am](https://cloud.githubusercontent.com/assets/214142/5127645/196703d0-709b-11e4-97a5-496baa8dd11d.png)