Hotfix/pie chart section space on html renderer

[imaNNeo]

There is an issue with Path.combine() in the Flutter when we use HTML renderer,
we use it to handle the sectionsSpace property of PieChartData. We decided to ignore this property when Path.combine() does not work.

More detail on: #955

[codecov]

Codecov Report

Merging #1327 (b7204de) into master (25e318a) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1327   +/-   ##
=======================================
  Coverage   86.02%   86.02%           
=======================================
  Files          45       45           
  Lines        2991     2991           
=======================================
  Hits         2573     2573           
  Misses        418      418           

Impacted Files	Coverage Δ
lib/src/chart/pie_chart/pie_chart_painter.dart	100.00% <100.00%> (ø)

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