indexing fix: ensure that index strings are always unicode

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@1348 fd906abe-77d9-0310-91a1-e0d9ade77398

README.txt

@@ -318,7 +318,7 @@ Index attributes adapter
   >>> from loops.resource import IndexAttributes
   >>> idx = IndexAttributes(doc1)
   >>> idx.text()
-  ''
+  u''
 
   >>> idx.title()
   u'doc1 Zope Info'

resource.py

@@ -237,8 +237,10 @@ class IndexAttributes(object):
     def text(self):
         context = self.context
         if not context.contentType.startswith('text'):
-            return ''
+            return u''
         data = context.data
+        if type(data) != unicode:
+            data = data.decode('UTF-8')
         # TODO: transform to plain text
         #return ' '.join((zapi.getName(context), context.title, data)).strip()
         return data