Illegal argument exception while initializing metric panel

server stacktrace:

SCHWERWIEGEND: Servlet.service() for servlet SAIM threw exception
java.lang.IllegalArgumentException: node index specified does not exist in underlying RootGraph
at ding.view.DGraphView.addNodeViewInternal(DGraphView.java:660)
at ding.view.DGraphView.addNodeView(DGraphView.java:622)
at de.uni_leipzig.simba.saim.cytoprocess.GraphProperties.addNode(GraphProperties.java:163)
at de.uni_leipzig.simba.saim.cytoprocess.Cytoprocess.addNode(Cytoprocess.java:189)
at de.uni_leipzig.simba.saim.cytoprocess.Cytoprocess.addNode(Cytoprocess.java:184)
at de.uni_leipzig.simba.saim.SAIMCytoprocess.addNode(SAIMCytoprocess.java:250)
at de.uni_leipzig.simba.saim.SAIMCytoprocess.addNode(SAIMCytoprocess.java:260)
at de.uni_leipzig.simba.saim.SAIMCytoprocess.loadMetricExpression(SAIMCytoprocess.java:102)
at de.uni_leipzig.simba.saim.SAIMCytoprocess.loadMetricExpression(SAIMCytoprocess.java:71)
at de.uni_leipzig.simba.saim.gui.widget.panel.MetricPanel.makeCytographer(MetricPanel.java:153)
at de.uni_leipzig.simba.saim.gui.widget.panel.MetricPanel.attach(MetricPanel.java:102)
at com.vaadin.ui.AbstractComponentContainer.attach(AbstractComponentContainer.java:97)
at com.vaadin.ui.Panel.attach(Panel.java:544)
at com.vaadin.ui.Window.attach(Window.java:2401)
at com.vaadin.ui.Window.setApplication(Window.java:941)
at com.vaadin.Application.addWindow(Application.java:358)
at com.vaadin.Application.setMainWindow(Application.java:670)
at de.uni_leipzig.simba.saim.SAIMApplication.init(SAIMApplication.java:103)
at com.vaadin.Application.start(Application.java:551)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.startApplication(AbstractApplicationServlet.java:1219)
at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:484)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861)
at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584)
at java.lang.Thread.run(Thread.java:662)

Cause unknown and was not able to reproduce it yet.

Start at MetricPanel.java lines 102 and 153, then follow the stack trace through SAIMCytoprocess.loadMetricExpression, Cytoprocess.addNode, GraphProperties.addNode, and DGraphView.addNodeView. Investigate the node index failure during metric-panel initialization and attempt to reproduce it. Done means the initialization no longer throws this exception, with a regression check for the failing path.

Written by the indexing model from the issue text.