Description of problem:

if I run cinder snapshot-list --volume-id with id which is not in the id length instead of getting an error we simply get empty results. 

Version-Release number of selected component (if applicable):

openstack-cinder-2013.1.2-3.el6ost.noarch

How reproducible:

100%

Steps to Reproduce:
1. create a snapshot for a volume 
2. run: cinder snapshot-list --volume-id <volumeID>
3. run: cinder snapshot-list --volume-id <name/ID with missing digits> 

Actual results:

instead of giving an error for id being illegal we have no results shown

Expected results:

if you give ID which is less than the normal length we should fail with error

Additional info:

[root@opens-vdsb ~(keystone_admin)]# cinder snapshot-list --volume-id e8850125-6179-4083-89fd-84461a85d1c1
+--------------------------------------+--------------------------------------+--------+--------------+------+
|                  ID                  |              Volume ID               | Status | Display Name | Size |
+--------------------------------------+--------------------------------------+--------+--------------+------+
| 7039d68f-e2c5-470b-a0f9-8592b72b155a | e8850125-6179-4083-89fd-84461a85d1c1 | error  |  snap_snap   |  10  |
+--------------------------------------+--------------------------------------+--------+--------------+------+
[root@opens-vdsb ~(keystone_admin)]# cinder snapshot-list --volume-id e8850125-6179-4083-89fd-84461a
[root@opens-vdsb ~(keystone_admin)]# cinder snapshot-list --volume-id e8850125-6179