IndigoException while calculating properties for molecules containing "Ba" atom

For some molecules Indigo throws the exceptions related to bad valences on atom "Ba", which shouldn't happen.

The example of the exception and corresponding code are shown below.

```
>>> from indigo import Indigo

>>> ba = indigo.loadMolecule('[Ba+]Cl')
>>> ba_semicl = indigo.loadMolecule('[Ba+]Cl')
>>> ba_semicl.molecularWeight()
172.7799949645996
>>> ba_semicl.grossFormula()
'Ba Cl'

>>> ba_from_file = indigo.loadMolecule('Ba_semiCl.mol')
>>> ba_from_file.grossFormula()
indigo.IndigoException: element: bad valence on Ba having 1 drawn bonds, charge 1, and 0 radical electrons
```