Avoid quoting empty strings when building URLs

[bdraco]

What do these changes do?

We guard against quoting empty strings in new but not in build

Quoting is the most expensive operation besides parsing IPs

Are there changes in behavior for the user?

no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.12%. Comparing base (164a045) to head (34d5781).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1126   +/-   ##
=======================================
  Coverage   95.12%   95.12%           
=======================================
  Files          30       30           
  Lines        4635     4636    +1     
  Branches      409      409           
=======================================
+ Hits         4409     4410    +1     
  Misses        200      200           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	95.08% <100.00%> (+<0.01%)	⬆️
MyPy	41.07% <100.00%> (+0.01%)	⬆️
OS-Linux	99.38% <100.00%> (ø)
OS-Windows	99.47% <100.00%> (ø)
OS-macOS	99.08% <100.00%> (ø)
Py-3.10.11	98.97% <100.00%> (ø)
Py-3.10.14	99.21% <100.00%> (ø)
Py-3.11.9	99.21% <100.00%> (ø)
Py-3.12.5	99.21% <100.00%> (ø)
Py-3.13.0-rc.1	99.21% <100.00%> (ø)
Py-3.8.10	98.92% <100.00%> (ø)
Py-3.8.18	99.16% <100.00%> (ø)
Py-3.9.13	98.92% <100.00%> (ø)
Py-3.9.19	99.16% <100.00%> (ø)
Py-pypy7.3.11	99.21% <100.00%> (ø)
Py-pypy7.3.16	99.21% <100.00%> (ø)
Py-pypy7.3.17	99.24% <100.00%> (ø)
VM-macos-latest	99.08% <100.00%> (ø)
VM-ubuntu-latest	99.38% <100.00%> (ø)
VM-windows-latest	99.47% <100.00%> (ø)
pytest	99.38% <100.00%> (ø)

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