Add Repair Job to clean up filter groups without columns

[blizzz]

After #1197 is fixed

Create a one time repair job that checks all view's filters and removes those that have no column set.

They typically look like {"columnId":null,"operator":null,"value":""} in the Database, as value for the filter column in oc_tables_views, but the null columnId is the important aspect.

In the follow up release, the quick fix from #1196 can be reverted again.