URB-2617. Fix missing import for MultiSelect2Widget

src/Products/urban/content/licence/PreliminaryNotice.py

@@ -14,6 +14,7 @@
 __docformat__ = 'plaintext'
 
 from AccessControl import ClassSecurityInfo
+from collective.archetypes.select2.select2widget import MultiSelect2Widget
 from Products.Archetypes.atapi import *
 from zope.interface import implements
 from Products.urban import interfaces