Fix get block (backport #781)

[mergify]

This is an automatic backport of pull request #781 done by Mergify.
Cherry-pick of bfe059e has failed:

On branch mergify/bp/release/v0.7.x/pr-781
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Unmerged paths:
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	both modified:   CHANGELOG.md
	both modified:   rpc/ethereum/backend/backend.go

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[codecov]

Codecov Report

Merging #791 (bfe059e) into release/v0.7.x (39c49c6) will increase coverage by 0.43%.
The diff coverage is 36.25%.

❗ Current head bfe059e differs from pull request most recent head 13aad6b. Consider uploading reports for the commit 13aad6b to get more accurate results

@@                Coverage Diff                 @@
##           release/v0.7.x     #791      +/-   ##
==================================================
+ Coverage           56.87%   57.30%   +0.43%     
==================================================
  Files                  64       71       +7     
  Lines                5352     6041     +689     
==================================================
+ Hits                 3044     3462     +418     
- Misses               2153     2377     +224     
- Partials              155      202      +47     

Impacted Files	Coverage Δ
app/export.go	13.38% <0.00%> (-0.10%)	⬇️
app/test_helpers.go	0.00% <0.00%> (ø)
client/keys.go	0.00% <0.00%> (ø)
client/testnet.go	0.00% <0.00%> (ø)
rpc/ethereum/pubsub/pubsub.go	78.48% <ø> (+78.48%)	⬆️
rpc/ethereum/types/addrlock.go	0.00% <ø> (ø)
rpc/ethereum/types/block.go	50.46% <ø> (+1.37%)	⬆️
rpc/ethereum/types/query_client.go	0.00% <ø> (ø)
rpc/ethereum/types/utils.go	0.00% <0.00%> (ø)
x/evm/client/cli/query.go	0.00% <ø> (ø)
... and 66 more

[lgtm-com]

This pull request introduces 5 alerts when merging 13aad6b into d5775ee - view on LGTM.com

new alerts:

• 4 for Unreachable statement
• 1 for Useless assignment to local variable