tools/scyllatop: fix crash due to mouse events
tools/scyllatop: fix crash due to mouse events

due to an urwid-library technicality, some mouse events like scroll or
click would crash scyllatop. This patch fixes this problem.

closes issue #1396.

Signed-off-by: Yoav Kleinberger <5d2e33f2c005733405d84da249995e6fe1b8bfe9@scylladb.com>
Message-Id: <1467294117-19218-1-git-send-email-5d2e33f2c005733405d84da249995e6fe1b8bfe9@scylladb.com>

scylladb/scylla,avikivity/scylla,scylladb/scylla,avikivity/scylla,kjniemi/scylla,scylladb/scylla,raphaelsc/scylla,avikivity/scylla,duarten/scylla,duarten/scylla,kjniemi/scylla,duarten/scylla,kjniemi/scylla,raphaelsc/scylla,scylladb/scylla,raphaelsc/scylla