Improve performance of converting a URL to a string

[bdraco]

The or "" check was not needed. Avoid one branch and string copy for the common case where scheme is set.

[codspeed-hq]

CodSpeed Performance Report

Merging #1422 will improve performances by 12.04%

_{Comparing url_to_str (65269fc) with master (b31eaa1)}

Summary

⚡ 3 improvements
✅ 82 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	url_to_str	Change
⚡	test_url_to_string	245.1 µs	218.7 µs	+12.04%
⚡	test_url_with_path_to_string	264.8 µs	237.8 µs	+11.36%
⚡	test_url_with_query_to_string	301.3 µs	275.3 µs	+9.47%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.06%. Comparing base (b31eaa1) to head (65269fc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1422   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files          31       31           
  Lines        5774     5774           
  Branches      348      348           
=======================================
  Hits         5547     5547           
  Misses        201      201           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	96.06% <100.00%> (ø)
MyPy	48.69% <100.00%> (ø)
OS-Linux	99.55% <100.00%> (ø)
OS-Windows	99.62% <100.00%> (ø)
OS-macOS	99.30% <100.00%> (ø)
Py-3.10.11	99.28% <100.00%> (ø)
Py-3.10.15	99.51% <100.00%> (ø)
Py-3.11.10	99.51% <100.00%> (ø)
Py-3.11.9	99.28% <100.00%> (ø)
Py-3.12.7	99.51% <100.00%> (ø)
Py-3.13.0	99.51% <100.00%> (ø)
Py-3.9.13	99.24% <100.00%> (ø)
Py-3.9.20	99.47% <100.00%> (ø)
Py-pypy7.3.16	99.53% <100.00%> (ø)
Py-pypy7.3.17	99.55% <100.00%> (ø)
VM-macos-latest	99.30% <100.00%> (ø)
VM-ubuntu-latest	99.55% <100.00%> (ø)
VM-windows-latest	99.62% <100.00%> (ø)
pytest	99.55% <100.00%> (ø)

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