[PATCH] Handle the case of removing an unallocated partition from the tree.

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This was causing a traceback after clicking "ok" on the dialog
stating that partition allocation failed due to insufficient
free space, adding insult to injury.
---
 storage/devicetree.py |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/storage/devicetree.py b/storage/devicetree.py
index 976d5d4..7288ad1 100644
--- a/storage/devicetree.py
+++ b/storage/devicetree.py
@@ -644,7 +644,9 @@ class DeviceTree(object):
             raise ValueError("Cannot remove non-leaf device '%s'" % dev.name)
 
         # if this is a partition we need to remove it from the parted.Disk
-        if isinstance(dev, PartitionDevice):
+        if isinstance(dev, PartitionDevice) and dev.disk is not None:
+            # if this partition hasn't been allocated it could not have
+            # a disk attribute
             dev.disk.partedDisk.removePartition(dev.partedPartition)
 
         self._devices.remove(dev)
-- 
1.6.0.6

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