Catching SQLite OperationalError when trying to load a catalog database with an old schema. This might not be specific enough to catch other issues.
Adding method to get the selected row index and changing getSelection() logic to be consistent.
Adding method to set the selected row
The next release is now selected after deleting a release
Selecting the new release row upon add. Implementing supporting method getReleaseRow() to find the row corresponding to a release ID.