I can repro as well - you can set it, you can change it, but once set you can't blank it out again.
Updating to "" doesn't work
Updating to "http://" doesn't work
I recommend setting to "http://www.example.com/" until bug is fixed
body must not be empty... [Duncanma]
Not limited to blog field - ALL fields on the profile page exhibit this behavior.
Possibly related to the enctype handling code for the avatar upload?
The bug was that User extended attributes that are null or empty string were not being serialized (so the the User extended attribute blob was not being updated).
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