POSSIBLE BUG: using Coalesce() with __in=[]

It seems that using an empty list when using the `__in=` filter prevents an Aggregate Coalesce from working properly. See below:

# Test with matched Queryset. Sum will return 50

OrderItem.objects.filter(pk__in=[1]).aggregate(test=Coalesce(Sum('quantity'), Value(0)))

>>> {'test': 50}

 

# Test with unmatched Queryset. Sum will return 0

OrderItem.objects.filter(pk__in=[-1]).aggregate(test=Coalesce(Sum('quantity'), Value(0)))

>>> {'test':0}

 

# Test with unmatched Queryset (using empty list). Sum will return NONE

OrderItem.objects.filter(pk__in=[]).aggregate(test=Coalesce(Sum('quantity'), Value(0)))

>>> {'test': None}

Can someone confirm? I will post as a bug if so.

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