From 308706e3d4709d48ea72c8332ad1ae135354d0b4 Mon Sep 17 00:00:00 2001
From: Julien Duponchelle <julien@gns3.net>
Date: Wed, 2 Nov 2016 10:20:43 +0100
Subject: [PATCH] Raise error if IOU image is not configured

Fix #757
---
 gns3server/compute/iou/iou_vm.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/gns3server/compute/iou/iou_vm.py b/gns3server/compute/iou/iou_vm.py
index f8146654..6858b76f 100644
--- a/gns3server/compute/iou/iou_vm.py
+++ b/gns3server/compute/iou/iou_vm.py
@@ -169,6 +169,8 @@ class IOUVM(BaseNode):
         Checks if IOUYAP executable is available and if image is accessible.
         """
 
+        if not self._path:
+            raise IOUError("IOU image is not configured")
         if not os.path.isfile(self._path) or not os.path.exists(self._path):
             if os.path.islink(self._path):
                 raise IOUError("IOU image '{}' linked to '{}' is not accessible".format(self._path, os.path.realpath(self._path)))