memusage extension: ignore exceptions when getting processes

[elacuesta]

Inspired by #331

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (a3aba41) to head (14767d6).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #348   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          627       630    +3     
=========================================
+ Hits           627       630    +3     

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