configuration: make "exclude" field optional (#525)
configuration: make "exclude" field optional (#525)

* Unignore schema

* Exclude optional, add docstrings

* Ignore schema again

larshp/abapOpenChecksJS,larshp/abaplint,larshp/abaplint,larshp/abapOpenChecksJS,larshp/abaplint,larshp/abapOpenChecksJS,larshp/abaplint