Merge pull request #3282 from RosettaCommons/roccomoretti/PDB_zero_coord_H
Fix one unrecognized res issue in PDB components loading.
When a PDB component is L-PEPTIDE LINKING, the H atom is special cased. Although the coordinates for H are reset later, at the time we check for too many zero coordinate atoms, it's still zero coordinates. Special case it, such that the hydrogen doesn't count against the 'too many missing coordinate' count.