Show PR settings on empty repos

[zeripath]

Previously the settings page would not show the PR section if the repository was empty.

Fix #12788

Signed-off-by: Andrew Thornton art27@cantab.net

[codecov-commenter]

Codecov Report

Merging #12808 into master will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12808      +/-   ##
==========================================
+ Coverage   43.16%   43.19%   +0.02%     
==========================================
  Files         651      651              
  Lines       72145    72145              
==========================================
+ Hits        31142    31161      +19     
+ Misses      35949    35935      -14     
+ Partials     5054     5049       -5     

Impacted Files	Coverage Δ
services/pull/check.go	47.69% <0.00%> (-2.31%)	⬇️
models/error.go	34.81% <0.00%> (-0.52%)	⬇️
models/issue_comment.go	53.75% <0.00%> (-0.16%)	⬇️
models/gpg_key.go	55.40% <0.00%> (+0.58%)	⬆️
services/gitdiff/gitdiff.go	74.48% <0.00%> (+1.63%)	⬆️
modules/charset/charset.go	75.28% <0.00%> (+6.74%)	⬆️
modules/indexer/stats/queue.go	76.47% <0.00%> (+11.76%)	⬆️
modules/indexer/stats/db.go	60.86% <0.00%> (+17.39%)	⬆️
modules/util/timer.go	85.71% <0.00%> (+42.85%)	⬆️

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