Bugfix
There is a MigrationProcessor for creating new reference-value or primitive database attributes.
- The processor for creating a reference attribute attempts to create an index for the reference. However, such an index does not always exist, e.g. for historical references. This leads to a NullPointerException.
- The processors update the tables by recreating the columns in the database. To do this, all "derivatives" of the base table are adjusted. An attempt is also made to adapt the database table of abstract `MOClass`es that do not exist, resulting in an error.
Test
No test.