nullptr dereference when moving mouse to map edge in tactical

[Asdow]

How to replicate: In Drassen, assign someone to helicopter, go to tactical and move the mouse to any map edge.

Game will crash due to nullptr dereference in strategicmap.cpp line 4941 when GetSoldierStructureForVehicle returns 0 for the soldier who's inside helicopter.

if ( OK_CONTROLLABLE_MERC( pSoldier ) && (pSoldier->bAssignment == CurrentSquad( ) || (pSoldier->bAssignment == VEHICLE && GetSoldierStructureForVehicle( pSoldier->iVehicleId )->bAssignment == CurrentSquad( ))) )