Merge pull request #2397 from RosettaCommons/vmullig/fix_link_issue
Fixing a minor issue with using simple_cycpep_predict with native PDB files containing LINK records
Requested by @gbhardwaj . When provided with a native structure with a LINK record specifying cyclic geometry, simple_cycpep_predict would attempt to set up cyclic geometry anew, first stripping off terminal types. When the terminal types were absent, it would crash. This fixes that.