Empty state response

[Kouprin]

Related to #1052.

[codecov]

Codecov Report

Merging #1979 into staging will decrease coverage by 0.33%.
The diff coverage is 77.13%.

@@             Coverage Diff             @@
##           staging    #1979      +/-   ##
===========================================
- Coverage    87.37%   87.03%   -0.34%     
===========================================
  Files          167      170       +3     
  Lines        31851    33547    +1696     
===========================================
+ Hits         27830    29199    +1369     
- Misses        4021     4348     +327

Impacted Files	Coverage Δ
runtime/near-vm-logic/src/gas_counter.rs	94.44% <ø> (ø)	⬆️
runtime/near-vm-runner/src/cache.rs	100% <ø> (ø)	⬆️
runtime/near-vm-runner/src/imports.rs	100% <ø> (ø)	⬆️
chain/client/src/lib.rs	0% <ø> (ø)	⬆️
chain/jsonrpc/client/src/lib.rs	83.58% <ø> (ø)	⬆️
runtime/near-vm-logic/src/types.rs	33.33% <ø> (ø)	⬆️
test-utils/testlib/src/user/mod.rs	58.24% <ø> (ø)	⬆️
chain/client/src/types.rs	77.77% <ø> (-1.91%)	⬇️
test-utils/testlib/src/node/mod.rs	100% <ø> (ø)	⬆️
near/tests/stake_nodes.rs	97.44% <ø> (ø)	⬆️
... and 104 more

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[bowenwang1996]

what's the reason for splitting state request into StateRequestHeader and StateRequestPart?

[Kouprin]

what's the reason for splitting state request into StateRequestHeader and StateRequestPart?

Code quality. We're having less magic inside.
Technically, those requests are different. One of them is about getting State Header, and the other one is for getting State Part. That's why I decided to make things clearer by splitting original StateRequest.