diff -r c49ea62fe9fc -r b9b93ff09ebe web/hdalab/views/ajax.py
--- a/web/hdalab/views/ajax.py	Tue Mar 13 15:11:46 2012 +0100
+++ b/web/hdalab/views/ajax.py	Tue Mar 13 15:38:57 2012 +0100
@@ -25,7 +25,7 @@
         
     resobj["content_count"] = Datasheet.objects.filter(taggedsheet__tag__label__iexact = label).distinct().count()
 
-    res = Tag.objects.select_related('dbpedia_fields').filter(label__iexact = label).order_by('-dbpedia_uri')[0:1]
+    res = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = label).order_by('-dbpedia_uri')[0:1]
     if len(res) == 1:
         restag = res.get()
         resobj["dbpedia_uri"] = restag.dbpedia_uri
@@ -69,7 +69,7 @@
     masters = []
     
     for lbl in labelslist:
-        labelqs = Tag.objects.select_related('dbpedia_fields').get(label__iexact = lbl)[0:1]
+        labelqs = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = lbl)[0:1]
         if len(labelqs) > 0:
             tag = labelqs.get()
             if tag.dbpedia_fields:
@@ -129,7 +129,7 @@
     q = request.GET.get('term',None)
     if q:
         lq = q.lower()
-    qs = Tag.objects.filter( Q(label__icontains = q ) | Q(dbpedia_fields__translations__label__icontains = q, dbpedia_fields__translations__language_code=request.LANGUAGE_CODE)) if q else Tag.objects.all()        
+    qs = Tag.objects.filter( Q(label__icontains = q ) | Q(dbpedia_fields__translations__label__icontains = q, dbpedia_fields__translations__language_code=request.LANGUAGE_CODE), ~Q(dbpedia_uri = None)) if q else Tag.objects.filter(~Q(dbpedia_uri = None))       
     qs = qs.annotate(nb=Count('datasheet')).order_by('-nb')[:20]
     
     qslist = list(qs)
@@ -173,9 +173,9 @@
         
         matchtagids = []
         
-        tagqs = Tag.objects.exclude(category__label__in = ['Datation', 'Localisation', 'Discipline artistique'])
+        tagqs = Tag.objects.exclude(category__label__in = ['Datation', 'Localisation', 'Discipline artistique']).filter(~Q(dbpedia_uri = None))
         countryqs = Country.objects
-        discqs = Tag.objects.filter(category__label = u'Discipline artistique').select_related('dbpedia_fields')
+        discqs = Tag.objects.filter(~Q(dbpedia_uri = None), category__label = u'Discipline artistique').select_related('dbpedia_fields')
         yearqs = TagYears.objects
         
         contentqs = Datasheet.objects.filter(validated=True)
@@ -190,10 +190,12 @@
                 delta = max(1, (end_year-start_year)/2)
                 minstart = start_year - delta
                 maxend = end_year + delta
-                matchtagqs = Tag.objects.filter(years__end_year__gte = start_year, 
-                                           years__start_year__lte = end_year,
-                                           years__end_year__lte = maxend,
-                                           years__start_year__gte = minstart)
+                matchtagqs = Tag.objects.filter(~Q(dbpedia_uri = None),
+                                                years__end_year__gte = start_year, 
+                                                years__start_year__lte = end_year,
+                                                years__end_year__lte = maxend,
+                                                years__start_year__gte = minstart,
+                                                )
                 matchtagids += [t.id for t in matchtagqs]
                 contentqs = contentqs.filter(taggedsheet__tag__in = matchtagqs,
                                taggedsheet__order__lte = max_tag_order)
@@ -201,7 +203,7 @@
             if label:
                 masters = []
                 for txtlbl in label.split(","):
-                    matchtagqs = Tag.objects.select_related('dbpedia_fields').filter(label__iexact = txtlbl.strip())
+                    matchtagqs = Tag.objects.select_related('dbpedia_fields').filter(~Q(dbpedia_uri = None), label__iexact = txtlbl.strip())
                     for t in matchtagqs:
                         if t.id not in matchtagids:
                             matchtagids.append(t.id)
@@ -215,7 +217,7 @@
                 
             if country:
                 for country_uri in country.split(","):
-                    matchtagqs = Tag.objects.filter(locatedin__country__dbpedia_uri = country_uri)
+                    matchtagqs = Tag.objects.filter(~Q(dbpedia_uri = None),locatedin__country__dbpedia_uri = country_uri)
                     matchtagids += [t.id for t in matchtagqs if t.id not in matchtagids]
                     contentqs = contentqs.filter(taggedsheet__tag__in = matchtagqs,
                                    taggedsheet__order__lte = max_tag_order)