Revert "Merge pull request #216 from JBou/master"

This reverts commit 8cb22bde125983237eb9ec9cff469839cb28acab, reversing
changes made to 5df916cb500d47fa3ef5a5701304bab08f4f1352.
Revert "Merge pull request #215 from JBou/master"

This reverts commit 5df916cb500d47fa3ef5a5701304bab08f4f1352, reversing
changes made to 757ef4f7fd7c80a5fbd9eb9ce9d2592cee769d6d.
Fix Program.cs
Don't add empty 'extra' fields to chat msg JSON