[views] fix externaluricomponent (same_as is symetric)

views.py

@@ -25,7 +25,7 @@ uicfg.actionbox_appearsin_addmenu.tag_subject_of(('ClassifiedAd', 'has_image', '
 class ExternalUriComponent(component.EntityVComponent):
     """component to display link to external uri"""
     __regid__ = 'externaluricomp'
-    __select__ = (component.EntityVComponent.__select__ & has_related_entities('same_as'))
+    __select__ = (component.EntityVComponent.__select__ & has_related_entities('same_as') & ~implements('ExternalUri'))
 
     context = 'ctxtoolbar'
 
@@ -36,7 +36,7 @@ class ExternalUriComponent(component.EntityVComponent):
         entity = self.cw_rset.get_entity(row, col)
         self.w(u'<div class="toolbarButton" id="%s">' % self.div_id())
         imgurl = self._cw.external_resource('BLUE_ARROW')
-        if entity.url:
+        if hasattr(entity, 'url'):
             url = entity.url
         else:
             url = entity.same_as[0].uri