Dropdown:Using query with null value

Build 1410 on map-legends
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BaselineBuild 320 on fix/2179-dropdown-containing-null-will-not-load
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Build 1410460a1d8
Current build. There are unaccepted changes, so build 320 is still the baseline.
Build 3200881847 current baseline
Accepted by Zach Stence.
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