SqliteQueueDatabase exception fix for #1189
No, `exc` is set in the `else` clause, which runs if no Exception is raised... I was mistaken! In Python 3, the expression: `except <Exception> as <var>` does not keep `<var>` in scope beyond the exception block. So you were correct in raising this issue. It is fixed in `master` now. Great! My bad, I didn't specify python version (it was 3.5, for the record)
Fixing reference before assignment error #1189 