Use more more optional chaining in the src/ folder

[Snuffleupagus]

Smaller diff with https://github.com/mozilla/pdf.js/pull/21661/changes?w=1

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.96%. Comparing base (4d9007e) to head (1813ab0).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21661      +/-   ##
==========================================
+ Coverage   89.79%   89.96%   +0.17%     
==========================================
  Files         263      263              
  Lines       66884    66886       +2     
==========================================
+ Hits        60061    60177     +116     
+ Misses       6823     6709     -114     

Flag	Coverage Δ
browsertest	66.52% <100.00%> (-0.03%)	⬇️
fonttest	9.04% <ø> (ø)
integrationtest	69.33% <100.00%> (+0.18%)	⬆️
unittest	57.57% <100.00%> (+<0.01%)	⬆️
unittestcli	56.52% <100.00%> (+0.01%)	⬆️

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[Snuffleupagus]

/botio browsertest

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.241.84.105:8877/1edec6305bf6a6a/output.txt

[moz-tools-bot]

From: Bot.io (Windows)

---

Received

Command cmd_browsertest from @Snuffleupagus received. Current queue size: 0

Live output at: http://54.193.163.58:8877/269ce5f67aeb67e/output.txt

[moz-tools-bot]

From: Bot.io (Linux m4)

---

Success

Full output at http://54.241.84.105:8877/1edec6305bf6a6a/output.txt

Total script time: 18.03 mins

• Regression tests: Passed

[moz-tools-bot]

From: Bot.io (Windows)

---

Success

Full output at http://54.193.163.58:8877/269ce5f67aeb67e/output.txt

Total script time: 23.58 mins

• Regression tests: Passed

[calixteman]

LGTM. Thank you.