Fix robot page exception on data explorer

[tongyu-microsoft]

There was an ICM for robot page exception on data explorer. We have seen similar issue before on undefined this.props.cohorts[this.props.selectedCohortIndex].

Checklist

• I have added screenshots above for all UI changes.
• I have added e2e tests for all UI changes.
• Documentation was updated if it was needed.

[gaugup]

Are there other places in the code that we will run into this error? Why not fix this in all places?

[tongyu-microsoft]

Are there other places in the code that we will run into this error? Why not fix this in all places?

this is the only place, we have handled all scenarios for this specific issue on this.props.cohorts[this.props.selectedCohortIndex]

[github-actions]

https://responsibleai.blob.core.windows.net/pullrequest/microsoft/responsible-ai-toolbox/tongy/fixRobotPAGE/dashboard/index.html