fix creating new objects
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@ -36,7 +36,7 @@ class MapitemFormMixin(ModelForm):
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LocationGroupCategory = self.request.changeset.wrap_model('LocationGroupCategory')
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categories = LocationGroupCategory.objects.all().prefetch_related('groups')
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instance_groups = set(self.instance.groups.values_list('pk', flat=True))
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instance_groups = set(self.instance.groups.values_list('pk', flat=True)) if self.instance.pk else set()
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self.fields.pop('groups')
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