From 3102f0a27d457148a4ccd7005204b227293c31f8 Mon Sep 17 00:00:00 2001
From: Markus Roth <markus.roth@herr-biber.de>
Date: Fri, 8 Nov 2013 23:53:39 +0100
Subject: [PATCH] Fix exception being raised when image is None.

---
 sloth/gui/labeltool.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sloth/gui/labeltool.py b/sloth/gui/labeltool.py
index 90caa31..dc65e80 100644
--- a/sloth/gui/labeltool.py
+++ b/sloth/gui/labeltool.py
@@ -130,6 +130,11 @@ class MainWindow(QMainWindow):
 
         img = self.labeltool.getImage(new_image)
 
+        if img == None:
+            self.controls.setFilename("")
+            self.selectionmodel.setCurrentIndex(new_image.index(), QItemSelectionModel.ClearAndSelect|QItemSelectionModel.Rows)
+            return
+
         h = img.shape[0]
         w = img.shape[1]
         self.image_resolution.setText("%dx%d" % (w, h))