dte.parse: fix edge case in parse_dte_xml

[glarrain]

Closes #43.

[codecov-io]

Codecov Report

Merging #44 into develop will decrease coverage by 0.37%.
The diff coverage is 67.74%.

@@             Coverage Diff             @@
##           develop      #44      +/-   ##
===========================================
- Coverage    71.78%   71.41%   -0.38%     
===========================================
  Files           16       16              
  Lines          762      780      +18     
  Branches       100      106       +6     
===========================================
+ Hits           547      557      +10     
- Misses         173      177       +4     
- Partials        42       46       +4

Impacted Files	Coverage Δ
cl_sii/dte/parse.py	80.15% <67.74%> (-5.03%)	⬇️
cl_sii/dte/data_models.py	58.27% <0%> (+0.71%)	⬆️

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