add the missing import to the 3139 fix I added, sigh

svn: r22712

po/POTFILES.in

@@ -307,6 +307,7 @@ gramps/gen/proxy/private.py
 gramps/gen/relationship.py
 gramps/gen/simple/_simpleaccess.py
 gramps/gen/utils/alive.py
+gramps/gen/utils/cast.py
 gramps/gen/utils/db.py
 gramps/gen/utils/docgen/odstab.py
 gramps/gen/utils/image.py

po/POTFILES.skip

@@ -247,7 +247,6 @@ gramps/gen/simple/_simpledoc.py
 gramps/gen/utils/__init__.py
 gramps/gen/utils/callback.py
 gramps/gen/utils/callman.py
-gramps/gen/utils/cast.py
 gramps/gen/utils/config.py
 gramps/gen/utils/debug.py
 gramps/gen/utils/file.py