FIX: Transaction::GetResultSet() now always returns a good reference

Summary

See title. For #11 (closed).

Focus

Is the unique_ptr handling correct?

Test Environment

Just run the unit tests. They failed before the fix.

Check List for the Author

• All automated tests pass
• Reference related Issues
• Up-to-date CHANGELOG.md
• Annotations in code (Gitlab comments)
  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

src/caosdb/unary_rpc_handler.cpp

@@ -112,7 +112,7 @@ void UnaryRpcHandler::handleCallCompleteState() {
 
   switch (status_.error_code()) {
   case grpc::OK:
-    CAOSDB_LOG_INFO(logger_name) << "UnaryRpcHandler finished successfully.";
+    CAOSDB_LOG_TRACE(logger_name) << "UnaryRpcHandler finished successfully.";
     break;
   default:
     auto code(static_cast<StatusCode>(status_.error_code()));