go/storage/client: Catch GetDiff errors early

[kostko]

No description provided.

[codecov]

Codecov Report

Merging #4397 (e1af0dc) into master (4556f9c) will increase coverage by 0.11%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master    #4397      +/-   ##
==========================================
+ Coverage   69.01%   69.13%   +0.11%     
==========================================
  Files         413      413              
  Lines       46993    47006      +13     
==========================================
+ Hits        32434    32498      +64     
+ Misses      10588    10542      -46     
+ Partials     3971     3966       -5     

Impacted Files	Coverage Δ
go/storage/client/client.go	74.74% <73.33%> (-0.26%)	⬇️
...onsensus/tendermint/apps/beacon/state/state_vrf.go	73.33% <0.00%> (-13.34%)	⬇️
go/common/cbor/codec.go	78.37% <0.00%> (-5.41%)	⬇️
go/consensus/tendermint/full/services.go	77.69% <0.00%> (-3.85%)	⬇️
go/storage/mkvs/tree.go	89.28% <0.00%> (-3.58%)	⬇️
go/worker/beacon/worker_vrf.go	66.08% <0.00%> (-1.74%)	⬇️
go/storage/mkvs/insert.go	90.47% <0.00%> (-1.37%)	⬇️
go/runtime/nodes/grpc/grpc.go	71.33% <0.00%> (-1.03%)	⬇️
go/runtime/registry/host.go	75.00% <0.00%> (-0.97%)	⬇️
go/storage/api/grpc.go	68.22% <0.00%> (-0.85%)	⬇️
... and 26 more

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