fix(platform): check validator before open Filtering Settings Dialog

[oscargong]

PR #11535 added validator input for p13 filter component.

But it caused a regression, when there is no <fdp-table-p13n-filter [validator]="validator" /> inside

<fdp-table-p13-dialog [table]="table"> </fdp-table-p13-dialog>

Table filter cannot be opened.

This issue can be reproduced on both 0.49 and 0.43

• StackBlitiz https://stackblitz.com/edit/p6cmyh?file=src%2Fapp%2Fplatform-table-p13-filter-example.component.html

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[mikerodonnell89]

@oscargong Did you commit with --no-verify? The linter was throwing an error. You'll likely see this problem with the main branch as well. I have pushed a fix to this PR. Thanks!