#25 OCM 0.23.12 crashes when hitting the display button

[teq2]

If no picture is selected, hitting the display button for the pictures causes ocm to crash -

arshaling clicked signal
Exception in Gtk# callback delegate
Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IndexOutOfRangeException: Array index is out of range.