Do not add polygon with less than 3 nodes.
Do not add polygon with less than 3 nodes.

REVIEW: 121967

tzapzoor/marble,tucnak/marble,tzapzoor/marble,quannt24/marble,tucnak/marble,quannt24/marble,tzapzoor/marble,tzapzoor/marble,tucnak/marble,tucnak/marble,quannt24/marble,probonopd/marble,probonopd/marble,probonopd/marble,tzapzoor/marble,probonopd/marble,probonopd/marble,tucnak/marble,quannt24/marble,tucnak/marble,tucnak/marble,tzapzoor/marble,quannt24/marble,quannt24/marble,probonopd/marble,tzapzoor/marble,quannt24/marble,tzapzoor/marble,probonopd/marble