fix: use remove_cvref_t in void or_else construct_empty

[marquisburg]

Void or_else failed to compile when the nullable was passed as an lvalue, because construct_empty was instantiated with a reference type.

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 complexity · 0 duplication

Metric	Results
Complexity	0
Duplication	0

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[coveralls]

Coverage Report for CI Build 26534309345

Coverage remained the same at 92.929%

Details

• Coverage remained the same as the base build.
• Patch coverage: 1 of 1 lines across 1 file are fully covered (100%).
• No coverage regressions found.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

No coverage regressions found.

---

Coverage Stats

Relevant Lines:	157
Covered Lines:	152
Line Coverage:	96.82%
Relevant Branches:	41
Covered Branches:	32
Branch Coverage:	78.05%
Branches in Coverage %:	Yes
Coverage Strength:	36.36 hits per line

---

💛 - Coveralls

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.71%. Comparing base (66f0f89) to head (3b0a4b4).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #17   +/-   ##
=======================================
  Coverage   96.71%   96.71%           
=======================================
  Files          11       11           
  Lines         152      152           
  Branches       23       23           
=======================================
  Hits          147      147           
  Misses          5        5           

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