Check if diff actually contains sections when rendering

[lafriks]

Fixes #9807

[techknowlogick]

should this be backport to 1.11?

[lafriks]

yes, v1.11 also have this bug just like v1.10 but I don't know if it is needed to backport it

[silverwind]

I think it was regressed in 149a9df which does not seem present on v1.10.

[codecov-io]

Codecov Report

Merging #9926 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #9926      +/-   ##
==========================================
- Coverage   42.28%   42.27%   -0.02%     
==========================================
  Files         608      608              
  Lines       79392    79392              
==========================================
- Hits        33573    33562      -11     
- Misses      41679    41688       +9     
- Partials     4140     4142       +2

Impacted Files	Coverage Δ
modules/git/utils.go	65.67% <0%> (-4.48%)	⬇️
modules/process/manager.go	74.69% <0%> (-3.62%)	⬇️
modules/convert/pull.go	66.95% <0%> (-3.48%)	⬇️
modules/repository/branch.go	52.1% <0%> (-2.53%)	⬇️
modules/git/repo.go	44.49% <0%> (-0.92%)	⬇️
routers/repo/view.go	38.59% <0%> (-0.88%)	⬇️
services/pull/check.go	56.64% <0%> (ø)	⬆️
models/error.go	31.31% <0%> (+0.54%)	⬆️
services/pull/pull.go	36.12% <0%> (+1.14%)	⬆️
services/pull/patch.go	66.03% <0%> (+1.25%)	⬆️

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[lunny]

@lafriks please rebase.