fix unexpected exception - access to not existing metadata results in empty string not in exception
fix unexpected exception
- access to not existing metadata results in empty string
not in exception

jschnasse/regal-api,jschnasse/regal-api,edoweb/regal-api,edoweb/regal-api,jschnasse/regal-api,edoweb/regal-api,jschnasse/regal-api,edoweb/regal-api