plugins/sources/patch.py: Validate keys

Tom Coldrickrequested to merge
coldtom/validate-patch into master

Description

Currently we don't validate the keys on patch sources, leading to dodgy error messages if path is not specified. This adds a validation, as in other plugins.

Changes proposed in this merge request:

  • Validate keys in patch.py

This merge request, when approved, will close: it didn't seem worth opening an issue for a 1 line change

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