SgField._valueSg now throws when the Shotgun search doesnt return a value
SgField._valueSg now throws when the Shotgun search doesnt return a value

_valueSg use to return None but now an Exception is raised when the Shotgun
query doesn't return the fields value.  This is most likely because the schema
has changed and the ORM doesn't reflect the new schema.

ndunsworth/python-shotgunorm