Breaking: #68303 - Make tt_content imagewidth/imageheight nullable 

See forge#68303

Description 

The default value of the fields imagewidth and imageheight of the tt_content table is now null. This removes the awkward UI behavior of the fields being set to 0 if no value is entered.

Impact 

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

Affected installations 

TYPO3 installation relying on fields imagewidth and imageheight of the tt_content table being always an integer.

Migration 

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

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