Merge pull request #317 from plotly/issue302_fix

Issue302 fix

Author: xarico10

plotly/plotlyfig_aux/handlegraphics/updateLineseries.m

@@ -74,8 +74,8 @@ function updateLineseries(obj,plotIndex)
     ispolar = true;
 end
 
-%-if polar ezplot or not-%
-if abs(x(1)-x(end))<1e-5 && abs(y(1)-y(end))<1e-5
+%-if ezpolar or not-%
+if length(obj.State.Axis(plotIndex).Handle.Children) == 2
     ispolar = true;
 end