Merge pull request #111 from aptivate/fix_link_to_nonrelation_field_error_message_2

Fix error message to name the correct starting model.
Update changelog.rst
fix: get_value raised attribute error on model method call
Merge pull request #119 from titusz/fix-get-value

fix: get_value raised attribute error on model method call
Fix handling of invalid decimal values.

Catch all exceptions, not just ValueErrors. Just throw a ValueError regardless
of the original exception type: after all, it's an error with a value :)
Report the column name along with the error in case of all exceptions.