Use aliases while removing from the CommandMap

src/Discord.Net.Commands/Map/CommandMap.cs

@@ -36,23 +36,25 @@ namespace Discord.Commands
         }
         public void RemoveCommand(Command command)
         {
-            string text = command.Text;
-            int nextSpace = NextWhitespace(text);
-            string name;
+            foreach (string text in command.Aliases)
+            {
+                int nextSpace = NextWhitespace(text);
+                string name;
 
-            if (nextSpace == -1)
-                name = command.Text;
-            else
-                name = command.Text.Substring(0, nextSpace);
+                if (nextSpace == -1)
+                    name = command.Text;
+                else
+                    name = command.Text.Substring(0, nextSpace);
 
-            lock (this)
-            {
-                CommandMapNode nextNode;
-                if (_nodes.TryGetValue(name, out nextNode))
+                lock (this)
                 {
-                    nextNode.AddCommand(nextSpace == -1 ? "" : text, nextSpace + 1, command);
-                    if (nextNode.IsEmpty)
-                        _nodes.TryRemove(name, out nextNode);
+                    CommandMapNode nextNode;
+                    if (_nodes.TryGetValue(name, out nextNode))
+                    {
+                        nextNode.RemoveCommand(nextSpace == -1 ? "" : text, nextSpace + 1, command);
+                        if (nextNode.IsEmpty)
+                            _nodes.TryRemove(name, out nextNode);
+                    }
                 }
             }
         }