This fix the following error when value is Missing.Value :
Module plone.restapi.search.handler, line 93, in search
Module plone.restapi.serializer.catalog, line 60, in __call__
Module plone.restapi.serializer.summary, line 101, in __call__
Module collective.solr.contentlisting, line 170, in image_scales
Module collective.solr.flare, line 106, in image_scales
Module json, line 341, in loads
TypeError: the JSON object must be str, bytes or bytearray, not Missing
This fix the following error when value is
Missing.Value
: