HooksMaster: fix RunPhase logging
HooksMaster: fix RunPhase logging

In case of complete failure results is empty, return immediately
(tnx unittests).

Signed-off-by: Luca Bigliardi <e702700dc9a886e6138bb50811fbdce0772e040e@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

yiannist/ganeti,leshchevds/ganeti,mbakke/ganeti,apyrgio/snf-ganeti,bitemyapp/ganeti,dimara/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/snf-ganeti,andir/ganeti,leshchevds/ganeti,apyrgio/ganeti,andir/ganeti,grnet/snf-ganeti,apyrgio/ganeti,dimara/ganeti,grnet/snf-ganeti,leshchevds/ganeti,onponomarev/ganeti,ganeti/ganeti,mbakke/ganeti,bitemyapp/ganeti,yiannist/ganeti,yiannist/ganeti,ganeti-github-testing/ganeti-test-1,onponomarev/ganeti,ganeti/ganeti,mbakke/ganeti,ganeti/ganeti,andir/ganeti