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Description
This change will make the db managers import function more robust towards (some types of) invalid layers. cf issue #41152
Before trying to read the type of the layer when compling them for the drop down box, it checks if the layer value is of NoneType. This should not happen, but at least for some usage of the open layer plugin, a layer may end up as none type.
I have observed this issue in several earlier versions of qgis and the code has not been changed since at least 3.10 LTR, so it could, and probably should be backported to 3.10
Fixes #41152