Invalid Folder Parameter

[skaldarnar]

An invalid folder is passed to the directory chooser, causing an IAE.

TRACE  4923 - Init GameDirectory... [JavaFX Application Thread]   [org.terasology.launcher.TerasologyLauncher]
TRACE  4923 - Choose installation directory for the game... [JavaFX Application Thread] [org.terasology.launcher.TerasologyLauncher]
ERROR  4937 - The TerasologyLauncher could not be started! [JavaFX Application Thread] [org.terasology.launcher.TerasologyLauncher]
java.lang.IllegalArgumentException: Folder parameter must be a valid folder
    at com.sun.glass.ui.CommonDialogs.convertFolder(CommonDialogs.java:143) ~[jfxrt.jar:na]
    at com.sun.glass.ui.CommonDialogs.showFolderChooser(CommonDialogs.java:135) ~[jfxrt.jar:na]
    at com.sun.javafx.tk.quantum.QuantumToolkit.showDirectoryChooser(QuantumToolkit.java:1535) ~[jfxrt.jar:na]
    at javafx.stage.DirectoryChooser.showDialog(DirectoryChooser.java:100) ~[jfxrt.jar:na]
    at org.terasology.launcher.gui.GuiUtils.chooseDirectory(GuiUtils.java:45) ~[TerasologyLauncher/:na]
    at org.terasology.launcher.TerasologyLauncher.getGameDirectory(TerasologyLauncher.java:280) ~[TerasologyLauncher/:na]
    at org.terasology.launcher.TerasologyLauncher.start(TerasologyLauncher.java:79) ~[TerasologyLauncher/:na]
    at com.sun.javafx.application.LauncherImpl$5.run(LauncherImpl.java:319) [jfxrt.jar:na]
    at com.sun.javafx.application.PlatformImpl$5.run(PlatformImpl.java:219) [jfxrt.jar:na]
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:182) [jfxrt.jar:na]
    at com.sun.javafx.application.PlatformImpl$4$1.run(PlatformImpl.java:179) [jfxrt.jar:na]
    at java.security.AccessController.doPrivileged(Native Method) [na:1.7.0_55]
    at com.sun.javafx.application.PlatformImpl$4.run(PlatformImpl.java:179) [jfxrt.jar:na]
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:76) [jfxrt.jar:na]
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) [jfxrt.jar:na]
    at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:17) [jfxrt.jar:na]
    at com.sun.glass.ui.win.WinApplication$3$1.run(WinApplication.java:67) [jfxrt.jar:na]
    at java.lang.Thread.run(Thread.java:745) [na:1.7.0_55]

[Cervator]

Probably should be worked together with #245

[skaldarnar]

solved by #249