Empty allocation root

[dabasov]

Fixes

Changes

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

Merging #2183 (997388a) into staging (4277293) will increase coverage by 0.00%.
The diff coverage is 0.00%.

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@@           Coverage Diff            @@
##           staging    #2183   +/-   ##
========================================
  Coverage    27.70%   27.71%           
========================================
  Files          375      375           
  Lines        61843    61843           
========================================
+ Hits         17136    17140    +4     
+ Misses       42651    42643    -8     
- Partials      2056     2060    +4     

Flag	Coverage Δ
Unit-Tests	27.71% <0.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...go/0chain.net/smartcontract/storagesc/challenge.go	36.71% <0.00%> (ø)
code/go/0chain.net/core/datastore/worker.go	97.26% <0.00%> (-2.74%)	⬇️
...ain.net/smartcontract/storagesc/config_settigns.go	54.76% <0.00%> (ø)
...de/go/0chain.net/smartcontract/vestingsc/config.go	58.42% <0.00%> (+3.15%)	⬆️

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[peterlimg]

LGTM