Improve handling of broken GND references

src/enums/MDNodaRepository.php

@@ -143,7 +143,7 @@ enum MDNodaRepository implements MDValueEnumInterface, JsonSerializable {
 
         }
 
-        throw new MDInvalidNodaLink("Failed to get norm data repository based on the provided link");
+        throw new MDInvalidNodaLink("Failed to get norm data repository based on the provided link: " . $input);
 
     }
 
@@ -478,6 +478,10 @@ enum MDNodaRepository implements MDValueEnumInterface, JsonSerializable {
         if (str_contains($id, ' ')) {
             $id = strtr($id, [' ' => '', "\t" => '']);
         }
+        if (str_contains($id, ',')) {
+            $idParts = explode(',', $id);
+            $id = $idParts[0];
+        }
 
         if (filter_var($id, FILTER_VALIDATE_URL) !== false) {
             $toRemove = [];