More error messages.

weechat-matrix.py

@@ -1314,6 +1314,13 @@ def check_server_existence(server_name, servers):
 
 
 def matrix_command_help(args):
+    if not args:
+        message = ("{prefix}matrix: Too few arguments for command "
+                   "\"/matrix help\" (see the help for the command: "
+                   "/matrix help help").format(prefix=W.prefix("error"))
+        W.prnt("", message)
+        return
+
     for command in args:
         message = ""
 
@@ -1405,6 +1412,8 @@ def matrix_command_help(args):
         W.prnt("", "")
         W.prnt("", message)
 
+        return
+
 
 def matrix_server_command_listfull(args):
     def get_value_string(value, default_value):
@@ -1708,13 +1717,16 @@ def matrix_command_cb(data, buffer, args):
 
     split_args = list(filter(bool, args.split(' ')))
 
-    command, args = split_args[0], split_args[1:]
-
-    if not command:
-        # TODO print out error
+    if len(split_args) < 1:
+        message = ("{prefix}matrix: Too few arguments for command "
+                   "\"/matrix\" (see the help for the command: "
+                   "/help matrix").format(prefix=W.prefix("error"))
+        W.prnt("", message)
         return W.WEECHAT_RC_ERROR
 
-    elif command == 'connect':
+    command, args = split_args[0], split_args[1:]
+
+    if command == 'connect':
         connect_server(args)
 
     elif command == 'disconnect':
@@ -1828,7 +1840,9 @@ def matrix_command_topic_cb(data, buffer, command):
 
             if not topic:
                 room = server.rooms[room_id]
-                if room.topic:
+                if not room.topic:
+                    return W.WEECHAT_RC_OK
+
                 message = ("{prefix}Topic for {color}{room}{ncolor} is "
                            "\"{topic}\"").format(
                                prefix=W.prefix("network"),