Make file type error more informative (display file name)

kindlecomicconverter/KCC_gui.py

@@ -826,7 +826,7 @@ class KCCGUI(KCC_ui.Ui_mainWindow):
                     GUI.jobList.addItem(message)
                     GUI.jobList.scrollToBottom()
                 else:
-                    self.addMessage('This file type is unsupported!', 'error')
+                    self.addMessage('Unsupported file type for ' + message, 'error')
 
     def dragAndDrop(self, e):
         e.accept()