Fix bug when read public repo lfs file

[lunny]

will fix #5657

[codecov-io]

Codecov Report

Merging #5912 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #5912      +/-   ##
==========================================
+ Coverage   37.96%   37.98%   +0.01%     
==========================================
  Files         329      329              
  Lines       48404    48405       +1     
==========================================
+ Hits        18378    18386       +8     
+ Misses      27385    27378       -7     
  Partials     2641     2641

Impacted Files	Coverage Δ
modules/lfs/server.go	44.41% <100%> (+0.13%)	⬆️
models/repo_list.go	63.29% <0%> (-1.27%)	⬇️
routers/repo/view.go	47.3% <0%> (+1.19%)	⬆️
modules/process/manager.go	81.15% <0%> (+4.34%)	⬆️
models/unit.go	14.28% <0%> (+14.28%)	⬆️

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[zeripath]

I must have looked at this so many times and missed this. Might be worth sticking a comment in to say users don't necessarily need to be signed in - check for anonymous actress

[lunny]

@zeripath done.