Use provider_id only when no client id

So this is to always send a provider_id from the set, but only use it if we dont have a client_id

viringo/catalogs.py

@@ -117,6 +117,7 @@ def listRecords(
         provider_id, client_id = set_to_provider_client(set)
         results, total_records, paging_cursor = datacite.get_metadata_list(
             query=search_query,
+            provider_id=provider_id,
             client_id=client_id,
             from_datetime=from_,
             until_datetime=until,
@@ -159,6 +160,7 @@ def listIdentifiers(
         provider_id, client_id = set_to_provider_client(set)
 
         results, total_records, paging_cursor = datacite.get_metadata_list(
+            provider_id=provider_id,
             client_id=client_id,
             from_datetime=from_,
             until_datetime=until,

viringo/services/datacite.py

@@ -237,12 +237,17 @@ def get_metadata_list(
 
     params = {
         'detail': True,
-        'provider_id': provider_id,
-        'client_id': client_id,
         'page[size]': config.RESULT_SET_SIZE,
         'page[cursor]': cursor
     }
 
+    # Only use the provider id if we dont have a client id
+    # Otherwise just send client_id
+    if not client_id:
+        params['provider_id'] = provider_id
+    else:
+        params['client_id'] = client_id
+
     if datetime_query:
         if query:
             query = query + " AND " + datetime_query