Fix crash when reading custom log messages

My application is writing custom log messages to the log, these don't have the same format as the Exception-logs.
Because of that, the log-reader would crash because the regex did not return any matches

I changed the regex a bit, so that it supports log messages like:
```
2014-11-15 15:00:33 --- INFO: the actual message
```

The type and file are empty for these kind of messages.