Memory inspection commands no longer return loading errors

[knggk]

Fixes #1299

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.68%. Comparing base (aa2dd3e) to head (09d475d).
Report is 3 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #1317      +/-   ##
============================================
- Coverage     70.73%   70.68%   -0.05%     
============================================
  Files           115      115              
  Lines         63158    63159       +1     
============================================
- Hits          44674    44646      -28     
- Misses        18484    18513      +29     

Files with missing lines	Coverage Δ
src/commands.def	100.00% <ø> (ø)

... and 16 files with indirect coverage changes

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[hwware]

I would like to suggest only 3 commands except "memory stats" to be allowed during loading process because it costs a lot of resources and involves key issues. (key count, key used memory)