Now take advantage of new argument accepted by `AddGeometryColumn` in SpatiaLite 2.3 that allows geometry columns to specified as `NOT NULL`.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@10443 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/contrib/gis/db/backend/spatialite/field.py

@@ -25,8 +25,9 @@ class SpatiaLiteField(Field):
                style.SQL_FIELD(gqn(self.column)) + ', ' +
                style.SQL_FIELD(str(self.srid)) + ', ' +
                style.SQL_COLTYPE(gqn(self.geom_type)) + ', ' +
-               style.SQL_KEYWORD(str(self.dim)) + ');')
-
+               style.SQL_KEYWORD(str(self.dim)) + ', ' +
+               style.SQL_KEYWORD(str(int(not self.null))) +
+               ');')
         return sql
 
     def _geom_index(self, style, db_table):