Handle panic in indexer initialisation better

[zeripath]

Related #10494

[codecov-io]

Codecov Report

Merging #10534 into master will increase coverage by <.01%.
The diff coverage is 11.76%.

@@            Coverage Diff             @@
##           master   #10534      +/-   ##
==========================================
+ Coverage   43.68%   43.69%   +<.01%     
==========================================
  Files         586      586              
  Lines       81521    81538      +17     
==========================================
+ Hits        35612    35626      +14     
- Misses      41494    41497       +3     
  Partials     4415     4415

Impacted Files	Coverage Δ
modules/indexer/code/indexer.go	38.02% <10%> (-4.6%)	⬇️
modules/indexer/issues/indexer.go	57.52% <14.28%> (-0.02%)	⬇️
modules/indexer/stats/queue.go	62.5% <0%> (-18.75%)	⬇️
modules/indexer/stats/db.go	40.62% <0%> (-9.38%)	⬇️
modules/git/utils.go	65.67% <0%> (-4.48%)	⬇️
modules/queue/workerpool.go	56.93% <0%> (-1.07%)	⬇️
modules/git/repo.go	46.78% <0%> (-0.92%)	⬇️
models/error.go	29.23% <0%> (+0.51%)	⬆️
modules/queue/unique_queue_disk_channel.go	55.76% <0%> (+1.92%)	⬆️
... and 4 more

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