[views/forms] Fix EntityFieldsForm.link_to when parent entity is being created When the parent entity is being created and the inlined form is displayed, the parent entity has no eid yet and `peid` is usually 'A'. So int() raises a ValueError. Closes #4627739.

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Experiment with the search bar. Try queries like "card sometextualcontent" or

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"card wikiid index" or "345".