Merge pull request #2537 from RosettaCommons/roccomoretti/fix_missing_with_make_from_annotated
Fix bug with nullptr in make_pose_from_sequence.
ResidueTypeSet::name_mapOP can return a nullptr. This is an issue within make_pose_from_sequence(), if the sequence requires a residue that is unknown. With current master, this results in a segfault. This PR should fix that.