DB Migration / Fix things

[pjaudiomv]

This is here to track various data integrity items either due to old servers data or just in general

[pjaudiomv]

1. empty fields vs NULL. 2.x Servers would have empty strings in _comdef_meetings_main and in 3.x these fields are NULL.
2. a _comdef_meetings_data field for instance location_neighborhood could me an empty string. in 3.x this row would be removed and not exist.

A side effect of this is they show up as meeting changes. IE. email was changed from "" to "".

[alanb2718]

Some others:

• meetings that refer to a format that no longer exists
• meetings owned by a service body that was deleted
• service bodies with editors that no longer exist
• (maybe - since this is not currently checked for) different formats with the same key in the same language, e.g. two formats with key B in English