sqlitedbservice: provide error message with more context

cli/sqlitedbservice.cpp

@@ -11,7 +11,7 @@ bool SqliteDbService::fileExistsInDatabase(QString path, qint64 mtime)
     query.addBindValue(path);
     query.addBindValue(mtime);
     if(!query.exec())
-    {        throw QSSGeneralException("Error while trying to query for file existance");
+    {        throw QSSGeneralException("Error while trying to query for file existance: " + query.lastError().text());
     }
     if(!query.next())
     {
@@ -33,7 +33,7 @@ bool SqliteDbService::fileExistsInDatabase(QString path)
     query.prepare("SELECT 1 FROM file WHERE path = ?");
     query.addBindValue(path);
     if(!query.exec())
-    {        throw QSSGeneralException("Error while trying to query for file existance");
+    {        throw QSSGeneralException("Error while trying to query for file existance: " + query.lastError().text());
     }
     if(!query.next())
     {