examples/pipeline: fix CLI parsing crash
examples/pipeline: fix CLI parsing crash

Cannot dereference pointer for token[1] unless valid.

Fixes: 5074e1d551 ("examples/pipeline: add configuration commands")
Cc: stable@dpdk.org

Signed-off-by: Cristian Dumitrescu <25468b8a3698eeb3c368247f8635924bb4a1ce2c@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk