fix: do not validate if options is undefined (backport #15470)

[mergify]

This is an automatic backport of pull request #15470 done by Mergify.
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	both modified:   frappe/public/js/frappe/form/controls/link.js

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[surajshetty3416]

@shariquerik, @sumaiya2908 you might have to backport this PR first before backporting this PR.