Fix potential NPE in TaskSeriesCollection

jfree / jfreechart

A 2D chart library for Java applications (JavaFX, Swing or server-side).

http://www.jfree.org/jfreechart/

GNU Lesser General Public License v2.1

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Closed doublep closed 1 year ago

doublep commented 2 years ago

This check is already present in this file in other method overloads.