ciao-launcher: Fix drain in test server
ciao-launcher: Fix drain in test server

ciao-launcher-server did not correctly handle the Attach and Detach volume
errors.  drain reported null when those errors were generated.

Signed-off-by: Mark Ryan <f16215f7acd0bd7fdc465539215bd574c785b062@intel.com>

mcastelino/ciao,wcwxyz/ciao,mrkz/ciao,obedmr/ciao,erick0z/ciao,kaccardi/ciao,leoswaldo/ciao,tpepper/ciao,matthewrsj/ciao,wcwxyz/ciao,jorgevgut/ciao,tpepper/ciao,obedmr/ciao,01org/ciao,01org/ciao,rbradford/ciao,markdryan/ciao,matthewrsj/ciao,rbradford/ciao,wcwxyz/ciao,jorgevgut/ciao,tpepper/ciao,markdryan/ciao,mrkz/ciao,mcastelino/ciao,erick0z/ciao,leoswaldo/ciao,kaccardi/ciao,obedmr/ciao,leoswaldo/ciao,mrkz/ciao,matthewrsj/ciao,ciao-project/ciao,erick0z/ciao,jorgevgut/ciao,mcastelino/ciao,ciao-project/ciao