Fixed eav_config_entity throwing error message on removed entity model

[davidhiendl]

A fix for #3175 ensuring that the eav entity type class is present before proceeding to load it to gracefully handle removed modules and/or leftover data.

Purposely throws exception in developer mode to highlight the leftover data and only logs a statement once every time data is loaded from the database.

Related Pull Requests

• Introduced with EAV Config Cache #2993 cache/performance optimization due to eagerly loading all data

Fixed Issues (if relevant)

• Can't retrieve entity config (after delete extension) #3175

Manual testing scenarios (*)

1. Disable eav cache
2. Add entry to eav_entity_type table with non-existent model class

[davidhiendl]

Please note I only "fixed" the issue caused by eager loading of entity types, eager loading of attributes with non-existent models always caused issues in the past as well (eg. deleting a module with a class that was used as custom attribute source_model or frontend/backend type model always caused issues in the past, removing those checks would be quite extensive and I at least prefer to be warned "early" of such issues).

[sreichel]

Accidentally deleted all my VBox images and had no time to recreate.

Can't test it during next days.

[addison74]

@sven - I will make time these days to simulate your case. DDEV in my case requests only a couple of minutes to run an OM instance from scratch. I will install an extension then delete it from the file system. I should get your error, then I checkout this PR to see what happens. Do I need to take other steps to reproduce the issue?

[sreichel]

@addison74 thanks. I know it takes only minutes to setup OM, but I've to do some more things. Need a new HDD, update my whole system from Win7 (do not laugh 😂), but the most important ... my beloved dog is 9y now and I just want to spend as much time as possible with her.

To reproduce ... install the extension you sent me and remove all files. No further steps.

[davidhiendl]

It's much easier to simple insert a new entry into the eav_entity_type table with a non-existent model class.
(I did not actually install whatever extension caused the issue, because I don't have it but the exception clearly pointed to this. With the entity loading skipped it will also skip all attributes associated with that entity.)

[addison74]

I confirm this PR solves the issue reported here #3175.