Fix crash on macOS when unlocking database

[droidmonkey]

• Fix macOS: KeePassXC 2.7.3 segfault when unlocking database with quick unlock enabled #8639

This only affects macOS 13+ due to the use of nullptr when initializing std::string.

Screenshots

Testing strategy

Tested by forcing the use of TouchID code, still needs to be tested in a signed build to ensure all code paths are clean.

Type of change

• ✅ Bug fix (non-breaking change that fixes an issue)

[phoerious]

I'll test it later, but looks good to me.

[codecov-commenter]

Codecov Report

Base: 64.30% // Head: 64.28% // Decreases project coverage by -0.02% ⚠️

Coverage data is based on head (20cb6cd) compared to base (422fd91).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8676      +/-   ##
===========================================
- Coverage    64.30%   64.28%   -0.02%     
===========================================
  Files          341      341              
  Lines        44330    44330              
===========================================
- Hits         28502    28495       -7     
- Misses       15828    15835       +7     

Impacted Files	Coverage Δ
src/gui/Clipboard.cpp	78.95% <0.00%> (-7.02%)	⬇️
src/core/FileWatcher.cpp	86.75% <0.00%> (-1.20%)	⬇️
src/core/Entry.cpp	82.52% <0.00%> (-0.20%)	⬇️

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[phoerious]

No crash on 12.6 even without the patch. I will have to upgrade to 13 first. This is going to take a while.

[droidmonkey]

Yah it only crashes on 13

[phoerious]

I cannot even reproduce it on Ventura.

[phoerious]

But it doesn't do any harm either, so ship it.