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+++ This bug was initially created as a clone of Bug #889276 +++

Description of problem:
When operating within the virsh shell (as opposed to executing single virsh command), error text is often printed with invalid commands or failed operations.  However, in one case the 'domblkstat' command does not print any error.  Although executing it as a single virsh command does exit(1).  This is a devition from it's RHEL 5 behavior where it does print an error message in both cases (command-line and in-shell).  The problem has to do with proper handling of empty-string arguments.

Version-Release number of selected component (if applicable):
0.9.10-21.el6_3.6

How reproducible:
100%

Steps to Reproduce:
1. virsh
2. virsh# domblkstat <name> ""
  
Actual results:
Blank line then 'virsh#' prompt is presented

Expected results:
Similar to RHEL 5, an error message is printed:

error: command 'domblkstat' requires <device> option

Additional info:
Bug discovered with libvirt autotest

*** This bug has been marked as a duplicate of bug 889276 ***