[fix] Only write a parser file when the update was successfull and NO errors.
[fix] Only write a parser file when the update was successfull and NO errors.

This hopefully fixes #30, I couldn't find anything else that would cause this
behaviour as it's already pretty sandboxed.

Leooonard/useragent-1,zpzgone/useragent,User4martin/useragent,3rd-Eden/useragent