Added missing error message when no resource name is configured on serializer

[jokiefer]

Partial fix of #1019

Description of the Change

Enhanced the error message on get_resource type from serializer() to tell the user which serializer in which module is wrong configured.

Checklist

• PR only contains one change (considered splitting up PR)
• unit-test added
• documentation updated
• CHANGELOG.md updated (only for user relevant changes)
• author name in AUTHORS

[sliverc]

Thanks for working on this. See my inlines comments.

Additionally:

• add yourself to AUTHORS
• add changelog entry (I would add it to Fixed)
• run black formatting and look at linting issues (see Github Actions which are failing).

[sliverc]

Thanks. LGTM.