V14: Fix entity type container repository get

[Zeegaan]

Notes

• Fixed a bug, where the data-type/folde/{id}, would throw errors, if you provided a non-folder entity key. (For example, using a data-type key, not a data-type-folder key)

How to test

• Go to settings, and click one of you datatypes, copy the key of the datatype.
• Call thedata-type/folde/{id} endpoint with the data type key, this should now return a 404, not a 500

[nikolajlauridsen]

Looks good, tests good.

Also ensure that /data-type/{id} also returns 404 when given a folder key 👍