Fix QML undefined property assignment warnings

[dakejahl]

Replace ternary null-guards with optional chaining for nested Fact property access

Follow up from #13866

Needs to be fully tested

[github-actions]

Pre-commit Checks Failed

Status	Count
Passed	13
Failed	46

Hook Results

check yaml...............................................................Passed
check json...............................................................Passed
pretty format json.......................................................Failed
check xml................................................................Passed
check for merge conflicts................................................Passed
check for added large files..............................................Passed
trim trailing whitespace.................................................Passed
fix end of files.........................................................Failed
mixed line ending........................................................Passed
TruffleHog...............................................................Passed
clang-format.............................................................Failed
clang-tidy...............................................................Failed
ruff (legacy alias)......................................................Failed
ruff format..............................................................Failed
pyright..................................................................Failed
shellcheck...............................................................Failed
cmake-format.............................................................Failed
cmake-lint...............................................................Failed
Lint GitHub Actions workflow files.......................................Failed
yamllint.................................................................Passed
markdownlint.............................................................Failed
vale.....................................................................Failed
typos....................................................................Failed
Lint QML files...........................................................Failed
Qt static analysis (clazy)...............................................Passed
Check for Q_ASSERT in production code....................................Passed
Check vehicle null safety................................................Failed

Files Modified by Hooks

 .github/workflows/pr-checks.yml                | 1 -
 src/Utilities/Compression/CMakeLists.txt       | 2 --
 test/Utilities/FileSystem/QGCFileHelperTest.cc | 1 -
 3 files changed, 4 deletions(-)

How to Fix

./tools/pre-commit.sh
git add -u && git commit --amend --no-edit

_{Run ID: 20983329937}

[github-actions]

Build Results

Platform Status

Platform	Status	Details
Linux	Passed	View
Windows	Passed	View
MacOS	Passed	View
Android	Passed	View

All builds passed.

Artifact Sizes

Artifact	Size
QGroundControl.dmg	311.72 MB

No baseline available for comparison

_{Updated: 2026-01-14 06:20:22 UTC • Triggered by: MacOS}