Fix associated event types drawer info by checking for -1

[karelhala]

Description

When user clicks on first item in table the event types tab is empty. This is caused by checking for index which can be 0. This PR fixes such issue by checking if the index is undefined and not -1

RHCLOUD-RHCLOUD-37417

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Screenshots

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Checklist ☑️

• PR only fixes one issue or story
• Change reviewed for extraneous code
• UI best practices adhered to
• Commits squashed and meaningfully named
• All PR checks pass locally (build, lint, test, E2E)

• [-] (Optional) QE: Needs QE attention (OUIA changed, perceived impact to tests, no test coverage)
• [-] (Optional) QE: Has been mentioned
• [-] (Optional) UX: Needs UX attention (end user UX modified, missing designs)
• [-] (Optional) UX: Has been mentioned

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.30%. Comparing base (27e8252) to head (cd90b2d).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #665   +/-   ##
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  Coverage   91.30%   91.30%           
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  Files           3        3           
  Lines          23       23           
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  Hits           21       21           
  Misses          2        2