Convert 0 to perbill - make it consistent with commands/validate

[atodorov]

Description of proposed changes

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Practical tips for PR review & merge:

• All GitHub Actions report PASS
• Newly added code/functions have unit tests
  • Coverage tools report all newly added lines as covered
  • The positive scenario is exercised
  • Negative scenarios are exercised, e.g. assert on all possible errors
  • Assert on events triggered if applicable
  • Assert on changes made to storage if applicable
• Modified behavior/functions - try to make sure above test items are covered
• Integration tests are added if applicable/needed

[github-actions]

For full LLVM coverage report click here!

[codecov-commenter]

Codecov Report

Merging #1188 (ad995a6) into dev (f37d28f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #1188   +/-   ##
=======================================
  Coverage   74.62%   74.62%           
=======================================
  Files          74       74           
  Lines       10686    10686           
=======================================
  Hits         7974     7974           
  Misses       2712     2712           

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