go/storage/client: Don't treat "no nodes" as a permanent error

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #2785 into master will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2785      +/-   ##
==========================================
- Coverage   62.95%   62.83%   -0.13%     
==========================================
  Files         389      389              
  Lines       37077    37080       +3     
==========================================
- Hits        23343    23299      -44     
- Misses      10739    10801      +62     
+ Partials     2995     2980      -15     

Impacted Files	Coverage Δ
go/storage/client/client.go	76.76% <100.00%> (-0.13%)	⬇️
...oasis-node/cmd/debug/txsource/workload/transfer.go	0.00% <0.00%> (-63.81%)	⬇️
...ompute/txnscheduler/algorithm/batching/batching.go	78.66% <0.00%> (-6.67%)	⬇️
go/consensus/tendermint/roothash/roothash.go	65.54% <0.00%> (-6.00%)	⬇️
go/runtime/tagindexer/tagindexer.go	68.47% <0.00%> (-4.35%)	⬇️
go/worker/common/p2p/p2p.go	64.41% <0.00%> (-3.16%)	⬇️
go/runtime/transaction/transaction.go	75.90% <0.00%> (-2.41%)	⬇️
go/worker/compute/txnscheduler/committee/node.go	60.18% <0.00%> (-2.17%)	⬇️
go/storage/mkvs/urkel/iterator.go	84.37% <0.00%> (-1.25%)	⬇️
go/worker/common/committee/group.go	80.32% <0.00%> (-0.66%)	⬇️
... and 20 more

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