Mutes: only post 'all mutes posted' confirmation if there are more than a couple chunks

src/plugins/Mutes.ts

@@ -457,8 +457,10 @@ export class MutesPlugin extends ZeppelinPlugin<IMutesPluginConfig> {
     }
 
     // let the user know we are done
+    if (chunks.length > 2) {
       msg.channel.createMessage(successMessage("All mutes for the specified filters posted!"));
     }
+  }
 
   /**
    * Reapply active mutes on join