Fixes error continuing execution when the parsing fails.
Signed-off-by: David Calavera <david.calavera@gmail.com>
(cherry picked from commit 3d3db0d4af)
The header row was not being printed when "docker ps" was invoked without containers thanks to the new format support, and we instead received a single blank line.
Signed-off-by: Andrew "Tianon" Page <admwiggin@gmail.com>