nickname fix

app.py

@@ -182,11 +182,11 @@ async def on_voice_state_update(member, before, after):
 
 @bot.event
 async def on_member_update(before, after):
-    if before.nick is None and after.nick is not None:
+    if before.nick == None and after.nick != None and after.nick != '':
         # User creates a nickname
         embed = Embed(description=f'{before} created the nickname {after.nick}', color=Color.blue())
         await bot.log_channel.send(embed=embed)
-    elif before.nick is not None and after.nick is None:
+    elif before.nick != None and (after.nick == None or after.nick == ''):
         # User removes their nickname
         embed = Embed(description=f'{before} removed their nickname', color=Color.blue())
         await bot.log_channel.send(embed=embed)