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java.lang.NullPointerException: null	at org.exist.xquery.tei.graphing.Visualization.parseListPersonGroup(Visualization.java:527)	at org.exist.xquery.tei.graphing.Visualization.parseListPersons(Visualization.java:224)	at org.exist.xquery.tei.graphing.Visualization.parseNamesDates(Visualization.java:189)	at org.exist.xquery.tei.graphing.Visualization.eval(Visualization.java:119)	at org.exist.xquery.BasicFunction.eval(BasicFunction.java:73)	at org.exist.xquery.InternalFunctionCall.eval(InternalFunctionCall.java:41)	at org.exist.xquery.DebuggableExpression.eval(DebuggableExpression.java:58)	at org.exist.xquery.LetExpr.eval(LetExpr.java:111)	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)	at org.exist.xquery.PathExpr.eval(PathExpr.java:276)	at org.exist.xquery.AbstractExpression.eval(AbstractExpression.java:71)	at org.exist.xquery.XQuery.execute(XQuery.java:253)	at org.exist.xquery.XQuery.execute(XQuery.java:185)	at org.exist.http.servlets.XQueryServlet.process(XQueryServlet.java:470)	at org.exist.http.servlets.XQueryServlet.doPost(XQueryServlet.java:191)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:583)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:566)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:159)	at org.eclipse.jetty.server.Dispatcher.forward(Dispatcher.java:74)	at org.exist.http.urlrewrite.Forward.doRewrite(Forward.java:50)	at org.exist.http.urlrewrite.XQueryURLRewrite.doRewrite(XQueryURLRewrite.java:545)	at org.exist.http.urlrewrite.XQueryURLRewrite.service(XQueryURLRewrite.java:349)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:845)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1689)	at de.betterform.agent.web.filter.XFormsFilter.doFilter(XFormsFilter.java:171)	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1668)	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:581)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524)	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226)	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1174)	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:511)	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185)	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1106)	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:119)	at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:396)	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134)	at org.eclipse.jetty.server.Server.handle(Server.java:524)	at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:319)	at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:253)	at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:273)	at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)	at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChannelEndPoint.java:93)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.executeProduceConsume(ExecuteProduceConsume.java:303)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:148)	at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:136)	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:671)	at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:589)	at java.lang.Thread.run(Thread.java:745)