[PR #9173/d3c3c6a7 backport][3.11] Avoid calling response prepare hook if its empty

[patchback]

This is a backport of PR #9173 as merged into master (d3c3c6a).

What do these changes do?

Avoid calling response prepare hook if its empty as its likely to be empty in most cases

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

related issue #2779

before

after

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.78%. Comparing base (a24d690) to head (65225c6).
Report is 2 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9189   +/-   ##
=======================================
  Coverage   97.78%   97.78%           
=======================================
  Files         108      108           
  Lines       34645    34646    +1     
  Branches     4123     4124    +1     
=======================================
+ Hits        33878    33879    +1     
  Misses        573      573           
  Partials      194      194           

Flag	Coverage Δ
CI-GHA	97.68% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.36% <100.00%> (-0.01%)	⬇️
OS-Windows	94.94% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	97.14% <100.00%> (+<0.01%)	⬆️
Py-3.10.14	97.08% <100.00%> (+0.18%)	⬆️
Py-3.10.15	?
Py-3.11.10	96.98% <100.00%> (?)
Py-3.11.9	97.04% <100.00%> (-0.26%)	⬇️
Py-3.12.5	97.08% <100.00%> (-0.01%)	⬇️
Py-3.12.6	97.14% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	97.04% <100.00%> (-0.01%)	⬇️
Py-3.9.19	96.99% <100.00%> (+0.07%)	⬆️
Py-3.9.20	?
Py-pypy7.3.16	96.58% <100.00%> (-0.01%)	⬇️
VM-macos	97.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.36% <100.00%> (-0.01%)	⬇️
VM-windows	94.94% <100.00%> (+<0.01%)	⬆️

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