Merge pull request #135 from Enstore-org/fix/media-changer-client

Fix/media changer client, missing a validation on a property.

src/media_changer_client.py

@@ -635,10 +635,18 @@ def do_work(intf):
             print ticket['volume_list']
             return
         if e_errors.is_ok(ticket) and ticket.get("volume_list", None):
-            print "%17s %10s %20s %20s" % ("volume", "type", "state", "location")
-            for volume in ticket['volume_list']:
-                print "%17s %10s %20s %20s" % (volume['volume'], volume['type'],
-                                         volume['state'], volume['location'])
+            if type(ticket['volume_list']) is str:
+                print ticket['volume_list']
+            else:
+                print "%17s %10s %20s %20s" % ("volume", "type", "state", "location")
+                for volume in ticket['volume_list']:
+                        print "%17s %10s %20s %20s" % (
+                        volume['volume'], 
+                        volume['type'],
+                        volume['state'], 
+                        volume['location']
+                        )
+            return
     elif intf.list_clean:
         ticket = mcc.list_clean()
         if e_errors.is_ok(ticket) and ticket.get("clean_list", None):