Fix dashboard issues labels filter bug

[lunny]

Fix #14084

[codecov-io]

Codecov Report

Merging #14210 (c51509f) into master (a07e67d) will increase coverage by 0.00%.
The diff coverage is 86.36%.

@@           Coverage Diff           @@
##           master   #14210   +/-   ##
=======================================
  Coverage   42.00%   42.00%           
=======================================
  Files         734      734           
  Lines       78770    78780   +10     
=======================================
+ Hits        33088    33095    +7     
- Misses      40246    40247    +1     
- Partials     5436     5438    +2     

Impacted Files	Coverage Δ
models/issue.go	57.05% <83.33%> (-0.04%)	⬇️
routers/user/home.go	60.58% <100.00%> (+0.31%)	⬆️
modules/indexer/stats/queue.go	64.70% <0.00%> (-11.77%)	⬇️
modules/indexer/stats/db.go	40.00% <0.00%> (-8.00%)	⬇️
modules/queue/unique_queue_disk_channel.go	53.84% <0.00%> (-1.54%)	⬇️
modules/log/event.go	59.90% <0.00%> (-0.95%)	⬇️
services/pull/check.go	48.52% <0.00%> (-0.74%)	⬇️
models/error.go	38.49% <0.00%> (-0.49%)	⬇️
services/pull/pull.go	42.85% <0.00%> (+0.50%)	⬆️
routers/repo/view.go	38.24% <0.00%> (+0.64%)	⬆️
... and 3 more

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[techknowlogick]

@lunny please backport :)