fix the python BDM client script to not fail when the command line options are wrong
fix the python BDM client script to not fail when the command line options are wrong

ldm5180/hammerhead,ldm5180/hammerhead,ldm5180/hammerhead,ldm5180/hammerhead,ldm5180/hammerhead,ldm5180/hammerhead,ldm5180/hammerhead