[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.
%(distname)s (0.1.0-1) unstable; urgency=low
* initial release
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