Description of problem:

When starting a Pipeline multiple times the console crashes sometimes with this JavaScript error:

TypeError: Cannot read property 'spec' of null
    at getPipelineTasks (pipeline-utils.ts:197)
    at getTopologyNodesEdges (utils.ts:230)
    at PipelineVisualization (PipelineVisualization.tsx:22)

I expect an issue that happen because the Pipeline or PipelineRun was updated from a previous PipelineRun.

Prerequisites (if any, like setup, operators/versions):

1. Install Pipelines Operator (tested with 1.1.2)

Steps to Reproduce

1. Import a Git Deployment and enable "Add Pipeline" option
2. Open the Pipelines overview and select on right hand side the action menu entry "Start Last Run"
3. Repeat step 2 multiple times until you get an error.

Actual results:

Frontend crash, see JavaScript error above

Expected results:

Opens the PipelineRun successfully similar to the first "Start Last Run" call.

Reproducibility (Always/Intermittent/Only Once):

Always (not the first time when starting the last run, but happens "Always" after 2-4 new tries.)

Build Details:

1. Pipelines Operator 1.1.2
2. console master (dfba93b36a085136220f17c280a02a4198abf274)

Additional info:

Release branches not tested yet.