tuna: Fix show_threads --cgroups run without a term

When tuna show_threads --cgroups is run without a term,
provide a default column size of 80 to fix a traceback
that occurred when querying the terminal size.

Signed-off-by: Leah Leshchinsky <lleshchi@redhat.com>
- Edited the commit title
- Edited the description
Signed-off-by: John Kacur <jkacur@redhat.com>
1 file changed