fix(xo-server/pool.mergeInto): dont export masterPassword on error
fix(xo-server/pool.mergeInto): dont export masterPassword on error

Fixes xoa-support#4265

lmcro/xo-web,vatesfr/xo-web,vatesfr/xo-web,lmcro/xo-web,lmcro/xo-web