Description of problem:

Trying to import a repository that includes GPG key, fails with the error below:

]# hammer content-import repository --path $(pwd) --organization-id 1
[.........................................................................................                                                                                                                                            ] [39%]
Error: Tried to load unspecified class: Sequel::SQL::Blob

Version-Release number of selected component (if applicable):
Satellite 6.12

How reproducible:
Always

Steps to Reproduce:
1.Create a custom repository
2. Create a content certificate of type GPG key and assign to custom repository
3. Sync the repository
4. Export the repository 
5. Try importing the exported repository into a Satellite

Actual results:
Import fails 

Expected results:
Import task would run and bring the GPG key AND the content to the disconnected Satellite


Additional info:
As workaround, one could remove the GPG key from the connected server, export the repository without the key and then create the key manually on the disconnected Satellite and then assign to the repo.