Selecting missing pattern will only Report.Error

- Instead of raising an exception
- bnc#875799
- This change makes it possible to continue even if some of the patterns are missing
Adapted test case
Changes and version
Adapted text of the error to make Josef happy :)
Hopefully even happier
Merge pull request #48 from kobliha/selecting_missing_patterns

Selecting missing default pattern changed from exception to reported error