+++ This bug was initially created as a clone of Bug #1035793 +++

Description of problem:
when after scheduler is not specified priority 'tuna -t $PID -p OTHER' (it doesn't matter if RR or FIFO or OTHER), tuna ends with traceback.

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

How reproducible:
alway

Steps to Reproduce:
1. install tuna
2. run tuna -t PID_OF_SOME_PROCESS -p OTHER
3. check output

Actual results:

[root@localhost ~]# tuna -t 3199 -p OTHER
Traceback (most recent call last):
  File "/usr/bin/tuna", line 598, in <module>
    main()
  File "/usr/bin/tuna", line 482, in main
    tuna.threads_set_priority(thread_list, a, affect_children)
  File "/usr/lib/python2.6/site-packages/tuna/tuna.py", line 479, in threads_set_priority
    rtprio = int(parms[0])
ValueError: invalid literal for int() with base 10: 'OTHER'


Expected results:
instead of traceback some warning and/or used some default value.

Additional info: