don't normalize amount if it doesn't exist

Some messages don't have an amount and currency.  So just chill.

Change-Id: I9b977ba3f54ddbcd95c216748805f3557ef485c4
Merge remote-tracking branch 'origin/master' into HEAD

* don't normalize amount if it doesn't exist

Change-Id: Iae4eec61eee775299944960d66504ac8ded139f3