Core/DBLayer: Fixed memory leaks when query returned empty result set

src/server/shared/Database/AdhocStatement.cpp

@@ -44,6 +44,7 @@ bool BasicStatementTask::Execute()
         ResultSet* result = m_conn->Query(m_sql);
         if (!result || !result->GetRowCount())
         {
+            delete result;
             m_result.set(QueryResult(NULL));
             return false;
         }