add missing import

Author: vipod

backend/src/ploneorg/src/ploneorg/content/serviceprovider.py

@@ -11,6 +11,7 @@
 from ploneorg.content.foundationsponsor import isEmail
 from ploneorg.content.foundationsponsor import isHTTP
 from ploneorg.vocabularies.countries import countries_vocabulary
+from ploneorg.vocabularies import org_size_vocabulary
 from zope import schema
 from zope.interface import alsoProvides
 from zope.interface import implementer