PCH Smart Linking: Fix issue with undefined 'wpParselySmartLinkingAllowedBlocks'

[vaurdan]

Description

As reported in #2684, in certain scenarios, such as in the Customizer block editor, the wpParselySmartLinkingAllowedBlocks will be undefined.

This PR adds a fallback when wpParselySmartLinkingAllowedBlocks, and therefore, fixes the undefined error that prevents widgets from being edited.

Motivation and context

• Closes Errors when editing widgets inside of Customizer #2684

How has this been tested?

Tested locally, by following the steps in #2684

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