improve empty notice

[lunny]

As title

[codecov-commenter]

Codecov Report

Merging #15890 (70e7652) into main (3a04d6f) will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main   #15890      +/-   ##
==========================================
- Coverage   44.03%   44.01%   -0.02%     
==========================================
  Files         681      681              
  Lines       82333    82336       +3     
==========================================
- Hits        36252    36237      -15     
- Misses      40180    40194      +14     
- Partials     5901     5905       +4     

Impacted Files	Coverage Δ
models/admin.go	59.09% <0.00%> (-2.82%)	⬇️
modules/util/timer.go	42.85% <0.00%> (-42.86%)	⬇️
modules/charset/charset.go	71.71% <0.00%> (-4.05%)	⬇️
modules/process/manager.go	72.83% <0.00%> (-2.47%)	⬇️
modules/log/event.go	59.90% <0.00%> (-1.89%)	⬇️
models/repo_list.go	77.04% <0.00%> (-0.78%)	⬇️
services/pull/pull.go	43.37% <0.00%> (-0.46%)	⬇️
modules/queue/unique_queue_disk_channel.go	48.63% <0.00%> (+1.36%)	⬆️

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