PR for v.1.5.1

[hcpchris]

• Closes Blank charts after 1.4.0 update when PieSeries is included #130

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (6726e8d) 88.25% compared to head (0f62a21) 88.31%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #133      +/-   ##
==========================================
+ Coverage   88.25%   88.31%   +0.06%     
==========================================
  Files         209      209              
  Lines       30472    30481       +9     
  Branches     2434     2437       +3     
==========================================
+ Hits        26892    26919      +27     
+ Misses       2669     2647      -22     
- Partials      911      915       +4     

Files	Coverage Δ
highcharts_core/js_literal_functions.py	64.46% <80.00%> (+5.50%)	⬆️

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