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[virt-tools-list] [PATCH v2 virt-manager] inspection: Check can_set_row_none before setting icon to None.

From: "Richard W.M. Jones" <rjones redhat com>

Previously one could set the icon field of a tree model to None, but
with Gtk3 and older versions of pygobject3 this would fail.

Use can_set_row_none to test for this condition and work around it.

The previous traceback was:

Traceback (most recent call last):
  File "/home/rjones/d/virt-manager/virtManager/manager.py", line 981, in vm_inspection_changed
    self.get_inspection_icon_pixbuf(vm, 16, 16)
  File "/usr/lib64/python2.7/site-packages/gi/overrides/Gtk.py", line 1152, in __setitem__
    self.model.set_value(self.iter, key, value)
  File "/usr/lib64/python2.7/site-packages/gi/overrides/Gtk.py", line 1298, in set_value
    Gtk.TreeStore.set_value(self, treeiter, column, value)
  File "/usr/lib64/python2.7/site-packages/gi/types.py", line 47, in function
    return info.invoke(*args, **kwargs)
TypeError: Argument 3 does not allow None as a value
 virtManager/manager.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/virtManager/manager.py b/virtManager/manager.py
index bdc21cf..25c3c57 100644
--- a/virtManager/manager.py
+++ b/virtManager/manager.py
@@ -977,8 +977,10 @@ class vmmManager(vmmGObjectUI):
         row = self.rows[self.vm_row_key(vm)]
-        row[ROW_INSPECTION_OS_ICON] = \
-            self.get_inspection_icon_pixbuf(vm, 16, 16)
+        new_icon = self.get_inspection_icon_pixbuf(vm, 16, 16)
+        if not can_set_row_none:
+            new_icon = new_icon or ""
+        row[ROW_INSPECTION_OS_ICON] = new_icon
         model.row_changed(row.path, row.iter)
     def get_inspection_icon_pixbuf(self, vm, w, h):

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