Replace core.Utils.isDefined for $defined.
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@@ -56,7 +56,7 @@ mindplot.CentralTopic.prototype.createChildModel = function(prepositionate)
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var childModel = mindmap.createNode(mindplot.NodeModel.MAIN_TOPIC_TYPE);
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if(prepositionate){
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if (!core.Utils.isDefined(this.___siblingDirection))
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if (!$defined(this.___siblingDirection))
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{
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this.___siblingDirection = 1;
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}
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