Added a fix for when the folder we previously referenced no longer exists.

gui/src/main/scala/com/sothr/imagetools/ui/controller/AppController.scala

@@ -174,6 +174,7 @@ class AppController extends Logging {
     val chooser = new DirectoryChooser()
     chooser.setTitle("ImageTools Browser")
 
+    try {
       val defaultDirectory = new File(currentDirectory)
       chooser.setInitialDirectory(defaultDirectory)
       val window = this.rootPane.getScene.getWindow
@@ -184,6 +185,20 @@ class AppController extends Logging {
       currentDirectory = selectedDirectory.getAbsolutePath
       PropertiesService.set("app.ui.lastPath", selectedDirectory.getAbsolutePath)
       this.currentDirectoryLabel.setText(selectedDirectory.getAbsolutePath)
+    } catch {
+      // fall back on the default because the directory we tried probably didn't exist
+      case iae: IllegalArgumentException =>
+        logger.error("The old directory no longer exists", iae)
+        chooser.setInitialDirectory(null)
+        val window = this.rootPane.getScene.getWindow
+        val selectedDirectory = chooser.showDialog(window)
+        info(s"Selected Directory: ${selectedDirectory.getAbsolutePath}")
+        selectedDirectoryLabel.setText(selectedDirectory.getAbsolutePath)
+
+        currentDirectory = selectedDirectory.getAbsolutePath
+        PropertiesService.set("app.ui.lastPath", selectedDirectory.getAbsolutePath)
+        this.currentDirectoryLabel.setText(selectedDirectory.getAbsolutePath)
+    }
   }
 
   @FXML