This small PR addresses an issue Angie found with my implementation of mutation masking and this issue about JSON line filtering. Local testing indicates that the latter change doesn't cause problems for locally generated files, but as I'm not directly familiar with the online UShER interface or the data it loads into the JSON output, @AngieHinrichs may want to verify that this behaves as expected and resolves the indicated issue as Roemer thinks it should.
This small PR addresses an issue Angie found with my implementation of mutation masking and this issue about JSON line filtering. Local testing indicates that the latter change doesn't cause problems for locally generated files, but as I'm not directly familiar with the online UShER interface or the data it loads into the JSON output, @AngieHinrichs may want to verify that this behaves as expected and resolves the indicated issue as Roemer thinks it should.