Query to extract T lane data

Hello All,

I have written a query to get T lane data for following fields,

1. Source

2. Destination

3. Product

4. MoT

5. Product Specific MoT

This report is getting executed successfully only when it finds product specific MoT data other wise it is not getting output.

Requirement is, if Product Specific MoT is data not available then it should get data of Source, Destination, Product & MoT.

Any suggestion would be much appreciated.

thanks.