Installation in a populated site: problems with getRawRelatedItems metadata

[cekk]

It seems that the installation in a populated site, have some problems with the new metadata "getRawRelatedItems".

If an item doesn't have any related item, the value of the metadata is "Missing.Value" and not an empty list.
A catalog update or just a relateditems reindex should resolve the problem.

Here is the traceback:

 Module zope.tales.tales, line 696, in evaluate
   - URL: /Users/cekk/Documents/workspace/buildout_prova_425/eggs/cciaa.modulistica-2.1.0-py2.7.egg/cciaa/modulistica/browser/cciaa_modulistica_view.pt
   - Line 23, Column 8
   - Expression: <PythonExpr (view.count_related_items(folderContents))>
   - Names:
      {'args': (),
       'container': <ATFolder at /Plone/cartella-a>,
       'context': <ATFolder at /Plone/cartella-a>,
       'default': <object object at 0x100d16bf0>,
       'here': <ATFolder at /Plone/cartella-a>,
       'loop': {},
       'nothing': None,
       'options': {},
       'repeat': <Products.PageTemplates.Expressions.SafeMapping object at 0x10c0f3aa0>,
       'request': <HTTPRequest, URL=http://localhost:8080/Plone/cartella-a/cciaa_modulistica_view>,
       'root': <Application at >,
       'template': <Products.Five.browser.pagetemplatefile.ViewPageTemplateFile object at 0x108d13d10>,
       'traverse_subpath': [],
       'user': <PropertiedUser 'admin'>,
       'view': <Products.Five.metaclass.SimpleViewClass from /Users/cekk/Documents/workspace/buildout_prova_425/eggs/cciaa.modulistica-2.1.0-py2.7.egg/cciaa/modulistica/browser/cciaa_modulistica_view.pt object at 0x10c0d3b90>,
       'views': <Products.Five.browser.pagetemplatefile.ViewMapper object at 0x10c01c690>}
  Module zope.tales.pythonexpr, line 59, in __call__
   - __traceback_info__: (view.count_related_items(folderContents))
  Module <string>, line 1, in <module>
  Module cciaa.modulistica.browser.modulistica, line 64, in count_related_items
TypeError: object of type 'Missing.Value' has no len()```