proper shutdown if core isn't created yet

gui/griffon-app/lifecycle/Ready.groovy

@@ -47,14 +47,12 @@ class Ready extends AbstractLifecycleHandler {
         def home = new File(application.getContext().getAsString("muwire-home"))
         def props = new Properties()
         def propsFile = new File(home, "MuWire.properties")
-        if (propsFile.exists()) {
+        if (propsFile.exists() && propsFile.length() > 0) {
             log.info("loading existing props file")
             propsFile.withReader("UTF-8", {
                 props.load(it)
             })
             props = new MuWireSettings(props)
-            if (props.incompleteLocation == null)
-                props.incompleteLocation = new File(home, "incompletes")
                 
             if (System.getProperties().containsKey("disableUpdates"))
                 props.disableUpdates = Boolean.valueOf(System.getProperty("disableUpdates"))
@@ -125,7 +123,7 @@ class Ready extends AbstractLifecycleHandler {
             
             JOptionPane.showMessageDialog(null, trans(key),
                     trans("CORE_INIT_ERROR_HEADER"), JOptionPane.WARNING_MESSAGE)
-            System.exit(0)
+            application.shutdown()
         }
     }
 }

gui/griffon-app/views/com/muwire/gui/MainFrameView.groovy

@@ -2236,7 +2236,20 @@ class MainFrameView {
     }
     
     void closeApplication() {
+        application.getWindowManager().findWindow("shutdown-window")?.setVisible(true)
+        JFrame mainFrame = builder.getVariable("main-frame")
+        mainFrame.setVisible(false)
+        
         Core core = application.getContext().get("core")
+        if (core == null) {
+            // save UI settings so language dialog does not appear again
+            if (settings != null) {
+                File uiPropsFile = new File(application.context.getAsString("muwire-home"), "gui.properties")
+                uiPropsFile.withOutputStream {settings.write(it)}
+            }
+            application.shutdown()
+            return
+        }
         
         def tabbedPane = builder.getVariable("result-tabs")
         settings.openTabs.clear()
@@ -2246,20 +2259,16 @@ class MainFrameView {
         settings.openTabs.removeAll(model.browses)
         settings.openTabs.removeAll(model.collections)
             
-        JFrame mainFrame = builder.getVariable("main-frame")
         settings.mainFrameX = mainFrame.getSize().width
         settings.mainFrameY = mainFrame.getSize().height
-        mainFrame.setVisible(false)
-        application.getWindowManager().findWindow("shutdown-window")?.setVisible(true)
-        if (core != null) {
-            Thread t = new Thread({
-                core.shutdown()
-                application.shutdown()
-            }as Runnable)
-            t.start()
-            File uiPropsFile = new File(core.home, "gui.properties")
-            uiPropsFile.withOutputStream { settings.write(it) }
-        }
+        File uiPropsFile = new File(core.home, "gui.properties")
+        uiPropsFile.withOutputStream { settings.write(it) }
+        
+        Thread t = new Thread({
+            core.shutdown()
+            application.shutdown()
+        }as Runnable)
+        t.start()
     }
     
     private class ResultTabsChangeListener implements ChangeListener {