Prevent NPE.

playChannel(), in the case of channel.channel coming out null for whatever reason, will already have
cleared out the controls via stop(channel).
Merge pull request #7 from roguenet/audioman-npe-fix

Prevent NPE.
Expose AppMode.regs
comment fix
cleanup: missing semicolons; imports; etc
FDT project
IDEA project file
Revert "IDEA project file"

This reverts commit 0de9d0779a7c591a74d480d044504dd6b1e4318b.