Breaking: #68303 - Make tt_content imagewidth/imageheight nullable 

See forge#68303

Description 

The default values of the fields imagewidth and imageheight in the tt_content table are now set to null.

This change removes the awkward UI behavior where the fields were previously set to 0 when no value was entered.

Impact 

Custom queries might fail if they expect the fields to be 0 instead of null.

Affected installations 

TYPO3 installations that rely on the imagewidth and imageheight fields of the tt_content table always being integers are affected.

Migration 

Use the "Media fields zero to null" upgrade wizard to update existing field values.

Also, modify your queries to handle null values instead of 0.