Fix cmd_hublevel not properly requiring a hublevel argument

doc/UPDATES

@@ -1,3 +1,5 @@
+* Fix cmd_hublevel not properly requiring a hublevel argument
+
 1.4.3
   * Default 'set promisc' to ignore since it's usually a false positive
     and doesn't matter much.

src/cmds.c

@@ -1518,6 +1518,13 @@ static void cmd_hublevel(int idx, char *par)
   struct userrec *u1 = NULL;
 
   handle = newsplit(&par);
+
+  if (!par[0]) {
+    dprintf(idx, "Usage: hublevel <bot> <level>\n");
+    dprintf(idx, "A hublevel is required.\n");
+    return;
+  }
+
   level = newsplit(&par);
   u1 = get_user_by_handle(userlist, handle);
   if (!u1 || !u1->bot) {