Don't require root privileges just to show a "No command specified" error

Check if a profile or command is specified before looking at EUID.

archiso/mkarchiso

@@ -827,16 +827,16 @@ while getopts 'p:r:C:L:P:A:D:w:o:s:c:g:vh?' arg; do
     esac
 done
 
+if (( OPTIND <= 1 )); then
+    _msg_error "No command specified" 0
+    _usage 1
+fi
+
 if (( EUID != 0 )); then
     _msg_error "${app_name} must be run as root." 1
 fi
 
 shift $((OPTIND - 1))
-
-if (( $# < 1 )); then
-    _msg_error "No command specified" 0
-    _usage 1
-fi
 command_name="${1}"
 
 # Set directory path defaults for legacy commands