Handle if tag is not found

cogs/tags.py

@@ -216,6 +216,7 @@ class Tags:
             trigger
         )
 
+        if tag is not None:
             embed = discord.Embed(title=tag['trigger'])
             creator = ctx.guild.get_member(tag['creator'])
             if creator:
@@ -224,6 +225,8 @@ class Tags:
             embed.add_field(name="Owner", value=creator.mention)
 
             await ctx.send(embed=embed)
+        else:
+            await ctx.send(f"I cannot find a tag named '{trigger}'")
 
 
 def setup(bot):