Print usage when called without flags.

wled

@@ -70,10 +70,15 @@ current_brightness() {
         sed -n 's/.*"state"[[:space:]]*:[[:space:]]*{[^}]*"bri"[[:space:]]*:[[:space:]]*\([0-9]\{1,3\}\).*/\1/p'
 }
 
+if test $# -eq 0; then
+    print_help
+    exit 0
+fi
+
 # Parse instance argument and store hostnames.
 while test $# -gt 0; do
     case "$1" in
-        ""|-h|--help) # Missing instance parameter.
+        -h|--help)
             print_help
             exit 0
         ;;