P: Smart-collection criterion "Rating is greater than <no stars>" matches photos with no stars

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In some circumstances, the smart-collection criterion "Rating is greater than <no stars>" matches photos with no stars. 

Tested on LR 11.1 / Mac OS 11.6.2.

To reproduce:

1. Make a new catalog and import two photos.

2. Set the rating of one photo to 1 star; leave the other photo with no stars.

3. Create a smart collection with two criteria, "Keywords contains <blank>" and "Rating is greater than <no stars>", in that order. When you add the Rating criterion, be sure not to click any of the stars:

4. Note that both photos are matched by the smart collection. But only the photo with 1 star should be matched.

5. Right-click the collection and do Export Smart Collection Settings.   Observe that the exported text file incorrectly contains these lines:

		{
			criteria = "rating",
			operation = ">",
		},

There should be a third line, "value = 0".

6. Edit the smart collection and click one star, then click that star again so that no stars are selected.

7. Observe that only the 1-star photo is now correctly matched by the smart collection.

8. Right-click the collection and do Export Smart Collection Settings.   Observe that the exported text file now correctly contains these lines:

		{
			criteria = "rating",
			operation = ">",
			value = 0,
		},