v4.2.0 Pre-Release 2: Fix for an error

This release fixes a null reference exception that would happen whenever a guide button press packet was received during device initialization.

This does not fix any of the issues people have been having with driver switching, unfortunately I'm not sure what I can do to address those. It also does not otherwise target any Riffmaster-specific fixes, a lot of the issues are difficult to debug without having the hardware on-hand.