Standard response to lack of arguments

karma.py

@@ -21,16 +21,25 @@ class Karma(BotPlugin):
     @botcmd
     def karma_add(self, message, args):
         """Adds karma"""
+        if not args:
+            return "**Usage**: !karma add <target>"
+
         self.karma[args] += 1
         return "Karma for {} is now {}".format(args, self.karma[args])
 
     @botcmd
     def karma_remove(self, message, args):
         """Removes karma"""
+        if not args:
+            return "**Usage**: !karma remove <target>"
+
         self.karma[args] -= 1
         return "Karma for {} is now {}".format(args, self.karma[args])     
 
     @botcmd
     def karma(self, message, args):
         """Gets karma"""
+        if not args:
+            return "**Usage**: !karma <target>"
+
         return "Karma for {} is {}".format(args, self.karma[args])