Improve test coverage for BaseURL
Created by: davemevans
This small change removes an unused section of code, with a corresponding comment to clarify what is happening. This also increases the test coverage for getBaseURLsFromElement to 100%.
The additional tests for BlacklistController and DVBSelector brings the test coverage for those modules to 100% (even though, in theory, the cases dealt with in DVBSelector should never be able to occur).