add some debugging code

src/collective/solr/indexer.py

@@ -316,7 +316,11 @@ class SolrIndexProcessor(object):
                     continue
             elif isinstance(value, (list, tuple)) and not field.multiValued:
                 separator = getattr(field, 'separator', ' ')
-                value = separator.join(value)
+                try:
+                    value = separator.join(value)
+                except UnicodeDecodeError:
+                    logger.warn('collective/solr/indexer.py:322, UnicodeDecodeError on %r', value)
+                    raise
             if isinstance(value, str):
                 value = unicode(value, 'utf-8', 'ignore').encode('utf-8')
             data[name] = value