Check command line parameter count instead of option count, and do it after...

Check command line parameter count instead of option count, and do it after evaluating option arguments

Fixes b6241cb1 .

archiso/mkarchiso

@@ -827,7 +827,9 @@ while getopts 'p:r:C:L:P:A:D:w:o:s:c:g:vh?' arg; do
     esac
 done
 
-if (( OPTIND <= 1 )); then
+shift $((OPTIND - 1))
+
+if (( $# < 1 )); then
     _msg_error "No command specified" 0
     _usage 1
 fi
@@ -836,7 +838,6 @@ if (( EUID != 0 )); then
     _msg_error "${app_name} must be run as root." 1
 fi
 
-shift $((OPTIND - 1))
 command_name="${1}"
 
 # Set directory path defaults for legacy commands