Experiment explorer throws exception when showing average values and sorting on a non-averagable column

[Nicklas Nordborg]

Go to the Experiment explorer for an experiment.

1. Display more columns, choose at least one that isn't averagable, such as [raw] block
2. Sort by the non-averagable column
3. Select the [avg] option

The following stack trace is displayed and it is impossible to get rid of it since all settings are remembered.

java.lang.UnsupportedOperationException
...at java.util.AbstractList.remove(AbstractList.java:144)
...at java.util.AbstractList$Itr.remove(AbstractList.java:360)
...at java.util.AbstractCollection.remove(AbstractCollection.java:252)
...at org.apache.jsp.views.experiments.explorer.view.view_jsp._jspService(view_jsp.java:255)
...at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
...at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
...at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
...at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)

...at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
...at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
...at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
...at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
...at net.sf.basedb.clients.web.servlet.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:71)
...at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
...at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
...at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
...at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
...at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
...at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
...at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
...at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
...at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
...at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
...at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
...at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
...at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
...at java.lang.Thread.run(Thread.java:619)

[Nicklas Nordborg]

(In [3520]) Fixes #652: Experiment explorer throws exception when showing average values and sorting on a non-averagable column