Fix protein layer generation and error handling in vrs_map#95

bencap wants to merge 2 commits intofeature/bencap/53/reference-identical-vrsVariantEffect/dcd_mapping2:feature/bencap/53/reference-identical-vrsfrom

bugfix/bencap/protein-layer-generated-unnecessarilyVariantEffect/dcd_mapping2:bugfix/bencap/protein-layer-generated-unnecessarilyCopy head branch name to clipboard