Prevent some zero length stuff

Don't send zero length messages to the server, and ignore the /me
command without any arguments.

chatcommands.go

@@ -26,7 +26,9 @@ var commands = &CommandControl{
 		common.CNMe.String(): Command{
 			HelpText: "Display an action message.",
 			Function: func(client *Client, args []string) string {
-				client.Me(strings.Join(args, " "))
+				if len(args) != 0 {
+					client.Me(strings.Join(args, " "))
+				}
 				return ""
 			},
 		},

wasm/main.go

@@ -224,6 +224,10 @@ func recieve(v []js.Value) {
 }
 
 func websocketSend(msg string, dataType common.ClientDataType) error {
+	if strings.TrimSpace(msg) == "" {
+		return nil
+	}
+
 	data, err := json.Marshal(common.ClientData{
 		Type:    dataType,
 		Message: msg,