commit c11616761952697dadb2b9a88b761d9816060c54
Author: Cole Robinson <crobinso@redhat.com>
Date:   Mon Aug 1 16:16:01 2011 -0400

    support: If getting HV version fails, just use 0
    
    If libvirt has issues building qemu caps, version can fail.

diff --git a/virtinst/support.py b/virtinst/support.py
index 1fb3e28..b1db501 100644
--- a/virtinst/support.py
+++ b/virtinst/support.py
@@ -373,9 +373,12 @@ def _hv_ver(conn, uri):
     if not _try_command(cmd, args):
         return 0
 
-    ret = cmd(*args)
-    if type(ret) == tuple:
-        ret = ret[1]
+    try:
+        ret = cmd(*args)
+        if type(ret) == tuple:
+            ret = ret[1]
+    except libvirt.libvirtError:
+        ret = 0
 
     return ret