Work around a crash when clearing annotations while creating a polygon.
Work around a crash when clearing annotations while creating a polygon.

The temporary placemark is connected to the tree model, simply deleting
it leads to a crash. Code needs refactoring.

Earthwings/marble,tzapzoor/marble,probonopd/marble,adraghici/marble,probonopd/marble,rku/marble,AndreiDuma/marble,quannt24/marble,quannt24/marble,utkuaydin/marble,tucnak/marble,quannt24/marble,probonopd/marble,David-Gil/marble-dev,adraghici/marble,rku/marble,tzapzoor/marble,probonopd/marble,tucnak/marble,tzapzoor/marble,tucnak/marble,tzapzoor/marble,tzapzoor/marble,AndreiDuma/marble,oberluz/marble,utkuaydin/marble,tzapzoor/marble,David-Gil/marble-dev,David-Gil/marble-dev,adraghici/marble,probonopd/marble,tucnak/marble,oberluz/marble,adraghici/marble,utkuaydin/marble,oberluz/marble,Earthwings/marble,AndreiDuma/marble,quannt24/marble,rku/marble,tucnak/marble,utkuaydin/marble,probonopd/marble,Earthwings/marble,Earthwings/marble,Earthwings/marble,rku/marble,AndreiDuma/marble,Earthwings/marble,tucnak/marble,tzapzoor/marble,David-Gil/marble-dev,tucnak/marble,adraghici/marble,rku/marble,David-Gil/marble-dev,probonopd/marble,oberluz/marble,oberluz/marble,David-Gil/marble-dev,utkuaydin/marble,AndreiDuma/marble,utkuaydin/marble,quannt24/marble,tzapzoor/marble,AndreiDuma/marble,quannt24/marble,adraghici/marble,oberluz/marble,quannt24/marble,rku/marble