Fix leftorth! and rightorth! with empty blocks

[Jutho]

Issue #204

[Jutho]

Should we tag a patch release after this is finished and merged?

[lkdvos]

I would say there is no reason not to.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.03%. Comparing base (4b1b265) to head (b8a5145).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #205   +/-   ##
=======================================
  Coverage   82.03%   82.03%           
=======================================
  Files          42       42           
  Lines        5371     5371           
=======================================
  Hits         4406     4406           
  Misses        965      965           

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