Michael,
I've been able to reproduce it: I'm not quite sure of the best way to deal
with it.
One solution is to set either null=True, or blank=True on the field, or set
a default.
The trick is, an empty string isn't valid JSON. I guess I've always been
using a default (usually of {} or [], depending upon context).
Happy for you to suggest improvements, though.
I believe it's actually related
to
https://bitbucket.org/schinckel/django-jsonfield/issue/13/integrityerrors-when-using-empty-string
Matt.
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