Fix exit code to be non-zero when error caused help display
Fix exit code to be non-zero when error caused help display

bjpop/biotool,biotool-paper/biotool,bjpop/biotool,lonsbio/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool,drpowell/biotool,bjpop/biotool,lonsbio/biotool,bjpop/biotool,drpowell/biotool,biotool-paper/biotool,drpowell/biotool,supernifty/biotool,drpowell/biotool,bjpop/biotool,biotool-paper/biotool,lonsbio/biotool,biotool-paper/biotool,drpowell/biotool,bjpop/biotool,supernifty/biotool,supernifty/biotool,biotool-paper/biotool,bjpop/biotool,supernifty/biotool,biotool-paper/biotool,drpowell/biotool,lonsbio/biotool,bjpop/biotool,biotool-paper/biotool,drpowell/biotool,bionitio-team/bionitio,supernifty/biotool,supernifty/biotool,supernifty/biotool,biotool-paper/biotool,bjpop/biotool,biotool-paper/biotool,supernifty/biotool,bjpop/biotool,supernifty/biotool,drpowell/biotool,supernifty/biotool