Adding another test when trying to save scope data due to startup error

java.lang.NullPointerException
	at
it.baeyens.arduino.monitor.views.ScopeView$3.handleEvent(ScopeView.java:187)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
	at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4362)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1113)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4180)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3769)
	at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$4.run(PartRenderingEngine.java:1127)
	at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
	at
org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1018)
	at
org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:156)
	at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:654)
	at
org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:337)
	at
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:598)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:150)
	at
org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:139)
	at
org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
	at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
	at
org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
	at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:380)
	at
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:235)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:669)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:608)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1515)

Author: jantje

it.baeyens.arduino.monitor/src/it/baeyens/arduino/monitor/views/ScopeView.java

@@ -184,8 +184,10 @@ public void handleEvent(Event event) {
 			    SWT.SAVE);
 		    dialog.setFilterExtensions(new String[] { "*.csv" }); //$NON-NLS-1$
 		    String fileName = dialog.open();
-		    if (!fileName.isEmpty()) {
-			ScopeView.this.myScope.saveData(fileName);
+		    if (fileName != null) {
+			if (!fileName.isEmpty()) {
+			    ScopeView.this.myScope.saveData(fileName);
+			}
 		    }
 		    this.inDrag = false;
 		    this.inSize = false;