add checks for items length

[hasanawad94]

Adresses #369
Add validation checks before accessing the Items in the e2e tests

[openshift-ci]

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[openshift-ci]

Hi @hasanawad94. Thanks for your PR.

I'm waiting for a openshift member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[kannon92]

/ok-to-test

[openshift-ci]

@hasanawad94: all tests passed!

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[hasanawad94]

I'm unable to see the exact error of instaslice-daemonset check