[PATH] fix conecutter core dumps

fix improperly passed arguments, trigger assert() in OCL, which causes an ugly core dump.

src/Mod/Path/PathScripts/PathSurfaceSupport.py

@@ -2555,6 +2555,7 @@ class OCL_Tool():
         if (self.diameter == -1.0 or self.cutEdgeHeight == -1.0):
             return
         self.tiltCutter = True
+        if self.cutEdgeHeight==0 : self.cutEdgeHeight = self.diameter/2
         self.oclTool = self.ocl.BallCutter(
                             self.diameter,
                             self.cutEdgeHeight + self.lengthOffset
@@ -2582,8 +2583,8 @@ class OCL_Tool():
             return
         self.oclTool = self.ocl.ConeCutter(
                             self.diameter,
-                            self.cutEdgeAngle,
-                            self.cutEdgeHeight + self.lengthOffset
+                            self.cutEdgeAngle/2,
+                            self.lengthOffset
                         )
 
     def _setToolMethod(self):