Bug fix (#574 substr outside of string error)

[azumakuniyuki]

• "substr outside of string" and "Use of uninitialized value" in Status.pm line 779 #574
• Fix the code to avoid following errors:
  • substr outside of string at lib/Sisimai/SMTP/Status.pm line 779.
  • Use of uninitialized value in ord at lib/Sisimai/SMTP/Status.pm line 779.
• Thanks to @ViktorNacht

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.32%. Comparing base (ac8b6dd) to head (1cb6d1a).
Report is 3 commits behind head on 5-stable.

Additional details and impacted files

@@            Coverage Diff            @@
##           5-stable     #575   +/-   ##
=========================================
  Coverage     88.32%   88.32%           
=========================================
  Files           125      125           
  Lines          5430     5430           
  Branches       1542     1542           
=========================================
  Hits           4796     4796           
  Misses          181      181           
  Partials        453      453           

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