logs: remove empty conversation filter error log

Removed empty conversation filter error log.
This log was triggered even when there were no conversation requests,
which is normal behavior.

Change-Id: Ibed0cc595470660abeb1885263be657d14e7537f

datastore/src/main/java/net/jami/datastore/dao/ConversationRequestDao.java

@@ -100,7 +100,6 @@ public class ConversationRequestDao extends AbstractDao<ConversationRequest> {
             List<Conversation> conversationList) {
         List<ConversationRequest> filteredConversationRequest = new ArrayList<>();
         if (conversationRequestList.isEmpty()) {
-            log.error("Unable to filter empty conversationRequest list");
             return filteredConversationRequest;
         }
         SQLConnection connection = DataStore.connectionPool.getConnection();