qvm-tools: fix error reporting in qvm-kill

qvm-tools/qvm-kill

@@ -21,8 +21,8 @@
 #
 #
 
-from qubes.qubes import QubesVmCollection
-from optparse import OptionParser;
+from qubes.qubes import QubesVmCollection,QubesException
+from optparse import OptionParser
 import subprocess
 import sys
 
@@ -48,7 +48,7 @@ def main():
 
     try:
         vm.force_shutdown()
-    except (IOError, OSError) as err:
+    except (IOError, OSError, QubesException) as err:
         print >> sys.stderr, "ERROR: {0}".format(err)
         exit (1)