Prevent setting place name to None

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@23473 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
Changes for Django 1.5.4

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@23474 4ae1f11a-8b86-4847-b8af-ab372f36d1fd
7182: Avoid using private functions in GExiv2 > 0.5

git-svn-id: svn+ssh://svn.code.sf.net/p/gramps/code/trunk@23476 4ae1f11a-8b86-4847-b8af-ab372f36d1fd