Improve checking of Set object
Improve checking of Set object

Phantomjs 2.0.0 was mislead by the way the checking of Set object was done.
NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,NabaviLab/CNV-Visualizer,igvteam/igv.js,igvteam/igv.js,NabaviLab/CNV-Visualizer