Update FileHandler.coffee

Restoring error check.

services/filestore/app/coffee/FileHandler.coffee

@@ -12,6 +12,7 @@ module.exports =
 	insertFile: (bucket, key, stream, callback)->
 		convetedKey = KeyBuilder.getConvertedFolderKey(key)
 		PersistorManager.deleteDirectory bucket, convetedKey, (error) ->
+			return callback(error) if error?
 			PersistorManager.sendStream bucket, key, stream, callback
 
 	deleteFile: (bucket, key, callback)->