Description of problem: topology page breaks with error 

Prerequisites (if any, like setup, operators/versions): have at least one workload node in the topology page

Steps to Reproduce:

 1. Load topology with at least one workload node

Actual results: topology page breaks with error

Expected results: topology page should load properly

Reproducibility (Always/Intermittent/Only Once): always

Build Details:  Master, Commit id: 21aa73fdc26deee6538a709557231f854413371b

Additional info: