ndi.database.fun.finddocs_missing_dependencies

  NDI_FINDDOCS_MISSING_DEPENDENCIES - find documents that have dependencies on documents that do not exist

  D = ndi.database.fun.finddocs_missing_dependencies(E)

  Searches the database of session E and returns all documents that have a 
  dependency ('depends_on') field for which the 'value' field does not 
  correspond to an existing document.

  The following form:

  D = ndi.database.fun.finddocs_missing_dependencies(E, NAME1, NAME2, ...)

  works similarly except that it only examines variables with depends_on
  fields with names NAME1, NAME2, etc.