[fix] Fix trial status resolver when status is None

[rohitvinnakota-codecov]

Resolves the following error

None is not a valid TrialStatus\n\nGraphQL request:14:9\n13 | trialEndDate\n14 | trialStatus\n | ^\n15 | trialStartDate
...
File \"/app/graphql_api/types/plan/plan.py\", line 35, in resolve_trial_status\n return TrialStatus(plan_service.trial_status)\n

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.02%. Comparing base (24784ce) to head (854c88a).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1076   +/-   ##
=======================================
  Coverage   96.02%   96.02%           
=======================================
  Files         828      828           
  Lines       19461    19463    +2     
=======================================
+ Hits        18687    18689    +2     
  Misses        774      774           

Flag	Coverage Δ
unit	92.30% <100.00%> (+<0.01%)	⬆️
unit-latest-uploader	92.30% <100.00%> (+<0.01%)	⬆️

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[codecov-notifications]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

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[github-actions]

✅ All tests successful. No failed tests were found.

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