[PATCH] Fixes issue #168 - charge assignment logic (#182)

Co-authored-by: Rodrigo V. Honorato <rvhonorato@protonmail.com>

Author: amjjbonvin

pdbtools/pdb_fromcif.py

@@ -176,10 +176,9 @@ def run(fhandle):
             occ = float(fields[labels.get('_atom_site.occupancy')])
             bfactor = float(fields[labels.get('_atom_site.B_iso_or_equiv')])
 
-            charge = fields[labels.get('_atom_site.pdbx_formal_charge')]
             try:
-                charge = charge
-            except ValueError:
+                charge = fields[labels.get('_atom_site.pdbx_formal_charge')]
+            except TypeError:
                 charge = '  '
 
             segid = chainid