Document link to a map fails if no geoserver layers

[Daniele Viganò]

Linking a document to a map fails if the map doesn't have a geoserver layer in it (i.e. Geodetic strain).

Internal Server Error: /documents/46
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/django/core/handlers/base.py", line 115, in get_response
    response = callback(request, *callback_args, **callback_kwargs)
  File "/usr/local/lib/python2.7/dist-packages/geonode/documents/views.py", line 110, in document_detail
    document.save()
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 546, in save
    force_update=force_update, update_fields=update_fields)
  File "/usr/lib/python2.7/dist-packages/django/db/models/base.py", line 570, in save_base
    update_fields=update_fields)
  File "/usr/lib/python2.7/dist-packages/django/dispatch/dispatcher.py", line 170, in send
    response = receiver(signal=self, sender=sender, **named)
  File "/usr/local/lib/python2.7/dist-packages/geonode/catalogue/models.py", line 100, in catalogue_pre_save
    record = catalogue.get_record(instance.uuid)
  File "/usr/local/lib/python2.7/dist-packages/geonode/catalogue/backends/pycsw_local.py", line 65, in get_record
    results = self._csw_local_dispatch(identifier=uuid)
  File "/usr/local/lib/python2.7/dist-packages/geonode/catalogue/backends/pycsw_local.py", line 151, in _csw_local_dispatch
    response = csw.getrecordbyid()
  File "/usr/lib/python2.7/dist-packages/pycsw/server.py", line 1538, in getrecordbyid
    self.kvp['outputschema'], self.repository.queryables['_all']))
  File "/usr/lib/python2.7/dist-packages/pycsw/plugins/profiles/apiso/apiso.py", line 508, in write_record
    bboxel = write_extent(val, self.namespaces)
  File "/usr/lib/python2.7/dist-packages/pycsw/plugins/profiles/apiso/apiso.py", line 632, in write_extent
    bbox2 = loads(bbox).envelope.bounds
  File "/usr/lib/python2.7/dist-packages/shapely/wkt.py", line 17, in loads
    "Could not create geometry because of errors while reading input."
ReadingError: Could not create geometry because of errors while reading input.