(bug 55348) Handle formatting of undeserializable values

this is a super simple solution that "unbreaks" diff display

It would be nice to display the more details about the "bad" value

Change-Id: I0eaa6a2b49b21e9ead1a0c6f3ebdd6616479b458
Merge "(bug 55348) Handle formatting of undeserializable values"