misc: don't fail on prefill attributes on titles in blocks (#45262)

wcs/blocks.py

@@ -216,7 +216,9 @@ class BlockSubWidget(CompositeWidget):
                 field.add_to_view_form(form=self, value=field_value)
             else:
                 field.add_to_form(form=self)
-                self.get_widget('f%s' % field.id).prefill_attributes = field.get_prefill_attributes()
+                widget = self.get_widget('f%s' % field.id)
+                if widget:
+                    widget.prefill_attributes = field.get_prefill_attributes()
         if value:
             self.set_value(value)
 

wcs/fields.py

@@ -410,6 +410,8 @@ class Field(object):
         return (None, False)
 
     def get_prefill_attributes(self):
+        if not self.prefill:
+            return
         t = self.prefill.get('type')
 
         if t == 'geolocation':