DelazJ
Check layout validity
Is your feature request related to a problem? Please describe. When exporting a layout from within QGIS, there's a validity check to flag problems, eg when a map item has an overview which is not linked to any existing maps. A message box is then displayed whether to continue the export or not. Skipping this check can result in wrong/incomplete map.
Describe the solution you'd like It could be nice to have such a mechanism with Maps Printer. Actually, instead of a message box, we could just report the missing items for each map.
Describe alternatives you've considered We can have a global setting to decide the behavior in such case:
- ignore the check and continue the export
- skip the layout's export if there's a missing item
- stop the whole export process
In all the cases a summary of the "broken" layouts until the stop should be output.
