Fix incorrect value for "available stock"

InvenTree/part/models.py

@@ -1345,7 +1345,8 @@ class Part(MPTTModel):
 
         queryset = OrderModels.SalesOrderAllocation.objects.filter(item__part__id=self.id)
 
-        pending = kwargs.get('pending', None)
+        # Default behaviour is to only return *pending* allocations
+        pending = kwargs.get('pending', True)
 
         if pending is True:
             # Look only for 'open' orders which have not shipped