Merge pull request #4225 from RosettaCommons/vmullig/no_nbr_atom_error
Adding check for NBR_ATOM and NBR_RADIUS lines in params files.
Currently, a params file without a NBR_ATOM line results in a very cryptic error when you try to score a pose containing that residue. Since a params file is really a Rosetta input, and users might provide their own, this isn't ideal: we should have proper error-handling with an informative error message if badly-formatted or incomplete inputs are provided. This pull request adds an explicit check for NBR_ATOM and NBR_RADIUS lines on params file read.