minor fixes 1.6.04

# 1.6.04
* Oops - Last build accidentally broken Nexus 7 portrait.  Thank Steve S for the fix.
* Increase throttle travel 2x (thanks Steve S)
* Don't warn about no gps until we have comms with vehicle (thanks Thomas N)
* Don't warn about battery % charge if there is no charge data available (thanks Thomas N)