LT-22641: Fix crash restoring a project from another computer

[papeh]

When getting the current dictionary configuration from the property table, ensure that the file exists. If the settings were restored from another computer, paths might not match, leading to a crash.

CI-ready checklist

• Commit messages follow .github/commit-guidelines.md.
• As much as possible, the change is unit tested.
• Builds & tests pass locally (or I've run the CI-style build via build.ps1, test.ps1, or MSBuild).
• If this is core-developer AI-assisted work, I followed Docs/workflows/ai-pr-workflow.md and ran pr-preflight or the equivalent branch-readiness review before requesting review.
• For any Src/** folders touched, corresponding AGENTS.md files are updated or explicitly confirmed still accurate.
• I have considered all comments from an AI code reviewer (such as Devin)

---

This change is 

[github-actions]

Comment hygiene (advisory)

1 comment-style violation(s) in the lines this branch adds since origin/main.
Advisory only -- no check fails on these, and the same violations appear as inline warnings on the Files changed tab.

File	Category	Comment
Src/xWorks/DictionaryExportService.cs:136	comment-too-long	254 chars (budget 200): ReSharper disable once ObjectCreationAsStatement - The Reversal Co...

Fix them per .claude/skills/fieldworks-code-commenting/SKILL.md.
Running .\build.ps1 -CommentHygiene (or .\test.ps1 -CommentHygiene) enforces them locally, and
re-wraps over-wide lines and repairs non-ASCII punctuation as it goes.

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   11m 11s ⏱️ +25s
5 857 tests +1  5 776 ✅ +1  81 💤 ±0  0 ❌ ±0 
5 866 runs  +1  5 785 ✅ +1  81 💤 ±0  0 ❌ ±0 

Results for commit 3d53e58. ± Comparison against base commit 064f6a2.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 71.42857% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.34%. Comparing base (064f6a2) to head (3d53e58).

Files with missing lines	Patch %	Lines
Src/xWorks/DictionaryConfigurationListener.cs	62.50%	2 Missing and 1 partial ⚠️
Src/xWorks/DictionaryExportService.cs	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1103      +/-   ##
==========================================
- Coverage   38.34%   38.34%   -0.01%     
==========================================
  Files        1507     1507              
  Lines      350586   350582       -4     
  Branches    40294    40294              
==========================================
- Hits       134448   134434      -14     
- Misses     186911   186921      +10     
  Partials    29227    29227              

Files with missing lines	Coverage Δ
Src/xWorks/DictionaryConfigurationController.cs	84.49% <100.00%> (ø)
Src/xWorks/DictionaryConfigurationListener.cs	38.23% <62.50%> (-1.48%)	⬇️
Src/xWorks/DictionaryExportService.cs	49.50% <0.00%> (-0.25%)	⬇️

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.