Bug no error message that not resource available

Some resources still have old IDs. Sometimes this lead to problems. The backend will fix the overall issue here: https://codebase.helmholtz.cloud/hmc/hmc/cct-1-mapping/information-portal/backend/-/issues/7

However, the frontend has the problem that nothing gets displayed (because the resource could not be loaded), but not error message appears. https://informationportal.helmholtz-metadaten.de/MappingItem/199013