Fix dump_ovs_flows crashing when no nodes are passed

Although it makes no sense that the lists of controller/compute nodes
are empty, the function should not crash.

This check ensures that the directory where the logs are written to is
always created before dumping anything.

Change-Id: I3a1fd8ac8ab983decb0bc227a2a22286ff5e34ce
Signed-off-by: Juan Vidal <juan.vidal.allende@ericsson.com>

0 files changed, 0 insertions, 0 deletions