Wrong order of tail and children

[knit-bee]

I added some checks to avoid the insertion of a tail before an element's children and adjusted the incorrect deletion of elements with tail where element.text evaluates to False.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.35%. Comparing base (fa972ab) to head (08457c4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #536      +/-   ##
==========================================
- Coverage   97.35%   97.35%   -0.01%     
==========================================
  Files          22       22              
  Lines        3439     3438       -1     
==========================================
- Hits         3348     3347       -1     
  Misses         91       91              

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