fix: drag of dot with zero value in dot plot

[kswenson]

[PT-188514748]

The fix replaces || with ??, where the former doesn't handle zero values correctly.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.66%. Comparing base (c59d12e) to head (05e38f3).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...c/components/graph/hooks/use-dot-plot-drag-drop.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1632      +/-   ##
==========================================
+ Coverage   85.57%   85.66%   +0.08%     
==========================================
  Files         600      600              
  Lines       30414    30414              
  Branches     8355     7779     -576     
==========================================
+ Hits        26027    26053      +26     
- Misses       4066     4206     +140     
+ Partials      321      155     -166     

Flag	Coverage Δ
cypress	75.16% <0.00%> (+0.11%)	⬆️
jest	52.59% <0.00%> (ø)

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[cypress]

codap-v3    Run #5250

Run Properties:   Passed #5250  •  05e38f3f8f: fix: drag of dot with zero value in dot plot

Project	codap-v3
Branch Review	188514748-fix-drag-zero-value
Run status	Passed #5250
Run duration	05m 56s
Commit	05e38f3f8f: fix: drag of dot with zero value in dot plot
Committer	Kirk Swenson
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	35
Skipped	0
Passing	220
View all changes introduced in this branch ↗︎

[bfinzer]

👍🏻LGTM