David Smith f22f660a33 [3.0.x] Adjusted model definition in GeoDjango tutorial.
The example uses the world border data set, where
one of the entries has a null field value.

Backport of 6bc9283751d51cab474d1bf6883a3b40cce32d4b from master
2020-06-17 20:17:42 +02:00
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