fix(app): fix white screen from def undefined

[koji]

Overview

const def = labwareDefinitions[definitionUri] is undefined so need a guard for that case

close AUTH-2588

Test Plan and Hands on Testing

1. download the protocol that is attached to the ticket
2. import the protocol
3. visualize the protocol
   check there is no white screen error

Changelog

• add null check

Review requests

Risk assessment

low

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 56.74%. Comparing base (652c8fd) to head (fdd62eb).
⚠️ Report is 1 commits behind head on edge.

Files with missing lines	Patch %	Lines
...src/utils/constructInvariantContextFromAnalysis.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             edge   #20384      +/-   ##
==========================================
- Coverage   56.74%   56.74%   -0.01%     
==========================================
  Files        3649     3649              
  Lines      303774   303777       +3     
  Branches    42724    42724              
==========================================
  Hits       172383   172383              
- Misses     131177   131180       +3     
  Partials      214      214              

Flag	Coverage Δ
protocol-designer	19.38% <0.00%> (-0.01%)	⬇️
step-generation	5.64% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...src/utils/constructInvariantContextFromAnalysis.ts	24.39% <0.00%> (-0.46%)	⬇️

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