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fix for sonarcloud-reported bug (#1945)
invalid "+" operation between incompatible types (str and type) - [sonarcloud-reported bug](https://sonarcloud.io/project/issues?issues=AYDHhHV9L8VDMGmTmRtc&open=AYDHhHV9L8VDMGmTmRtc&id=RDFLib_rdflib) Changed exception string construction to use `f""` format