Fix depth-less Face Detector pipeline

[AndreiMoraru123]

Hi @gespona,

Currently, the Dai Face Detector script crashes when setting UseDepth to false. This is because some cases were not handled in the source library.

This PR adds those checks. I also changed the default UseDepth to false, to show the intention, but I could revert it.

The rest of the diff is just whitespace, so you can look at it with the whitespace ignore option.