empty code and root fix

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1642 (5426542) into master (db9f229) will increase coverage by 0.04%.
The diff coverage is 45.55%.

❗ Current head 5426542 differs from pull request most recent head 20fbca5. Consider uploading reports for the commit 20fbca5 to get more accurate results

@@            Coverage Diff             @@
##           master    #1642      +/-   ##
==========================================
+ Coverage   52.53%   52.58%   +0.04%     
==========================================
  Files         480      481       +1     
  Lines       59986    60217     +231     
==========================================
+ Hits        31513    31663     +150     
- Misses      26095    26150      +55     
- Partials     2378     2404      +26     

Impacted Files	Coverage Δ
cmd/cortex/main.go	21.73% <ø> (ø)
cmd/utils/flags.go	1.84% <0.00%> (-0.01%)	⬇️
core/state/iterator.go	0.00% <0.00%> (ø)
core/state/journal.go	72.54% <0.00%> (-2.97%)	⬇️
core/state/snapshot/conversion.go	0.00% <0.00%> (ø)
core/state/snapshot/generate.go	0.00% <0.00%> (ø)
core/state/snapshot/journal.go	0.00% <0.00%> (ø)
core/state/snapshot/snapshot.go	40.94% <0.00%> (-0.70%)	⬇️
core/types/state_account.go	0.00% <0.00%> (ø)
core/vm/gas_table.go	11.88% <ø> (+0.24%)	⬆️
... and 29 more

... and 10 files with indirect coverage changes