FreeCAD is crashing during 'Solve Assembly' call if the Part property
(Assembly/Joints/Fixed/Joint Connector 1/Part1 or Assembly/Joints/Fixed/Joint
Connector 2/Part2) of fixed Joint is unset.
Steps to reproduce:
- make simple Assembly e.g. of two cubes with Fixed joint
- Select Fixed joint in the tree and go-to property 'Data' tab
- Select Part1 or Part2 of 'Joint Connector 1' or 'Joint Connector 2'
and remove this reference
- call 'Solve Assembly' now
The FreeCAD will crash here because the call
App::DocumentObject* part = getLinkObjFromProp(joint, propPartName);
will return NULL pointer.
The property Part1 or Part2 can get empty (unset) during usual
construction operations - during changing construction history
and it can be very hard to find the cause of FreeCAD crash on a big
model.
This patch tries to fix the crash in such situation.
4b5d079e6b