[TASK] Guard the account for NULL when getting a party
[TASK] Guard the account for NULL when getting a party

This could happen, if the account in the persistence was deleted during
a session.

Change-Id: I50627f00ba237a92b35da678e4f56dee7d92915d
Original-Commit-Hash: 2ae3f0ce684d00a0b352db1e7b0a3431a4551152

dfeyer/flow-development-collection,chewbakartik/flow-development-collection,dlubitz/flow-development-collection,kitsunet/flow-development-collection,mkeitsch/flow-development-collection,bwaidelich/flow-development-collection,aertmann/flow-development-collection,gerhard-boden/flow-development-collection,mkeitsch/flow-development-collection,bwaidelich/flow-development-collection,aertmann/flow-development-collection,dlubitz/flow-development-collection,neos/flow-development-collection,albe/flow-development-collection,neos/flow-development-collection,fcool/flow-development-collection,kitsunet/flow-development-collection,daniellienert/flow-development-collection,gerhard-boden/flow-development-collection,robertlemke/flow-development-collection,dlubitz/flow-development-collection,neos/flow-development-collection,fcool/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,mkeitsch/flow-development-collection,daniellienert/flow-development-collection,daniellienert/flow-development-collection,dfeyer/flow-development-collection,bwaidelich/flow-development-collection,kitsunet/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,robertlemke/flow-development-collection,fcool/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,gerhard-boden/flow-development-collection,robertlemke/flow-development-collection,albe/flow-development-collection,albe/flow-development-collection,kdambekalns/flow-development-collection,robertlemke/flow-development-collection,chewbakartik/flow-development-collection,aertmann/flow-development-collection