Update module manager action to handle invalid actions

- Also untabify the file

actions/module-manager

@@ -42,6 +42,8 @@ case "$1" in
             fi
         fi
     done
+    echo "failed to enable invalid module" "$3"
+    exit 1
     ;;
 
 "disable")
@@ -61,5 +63,7 @@ case "$1" in
             fi
         fi
     done
+    echo "failed to disable invalid module" "$3"
+    exit 1
     ;;
 esac