Merge pull request #3706 from etrombly/emptyPath

[PATH] don't generate gcode if op isn't valid. Don't plunge to start height if safe and clearance height are the same.

src/Mod/Path/PathScripts/PathAreaOp.py

@@ -487,7 +487,7 @@ class ObjectOp(PathOp.ObjectOp):
                 sims.append(sim)
             # Eif
 
-            if self.areaOpRetractTool(obj) and self.endVector is not None:
+            if self.areaOpRetractTool(obj) and self.endVector is not None and len(self.commandlist) > 1:
                 self.endVector[2] = obj.ClearanceHeight.Value
                 self.commandlist.append(Path.Command('G0', {'Z': obj.ClearanceHeight.Value, 'F': self.vertRapid}))
 

src/Mod/Path/PathScripts/PathOp.py

@@ -514,10 +514,6 @@ class ObjectOp(object):
 
         result = self.opExecute(obj)  # pylint: disable=assignment-from-no-return
 
-        if FeatureHeights & self.opFeatures(obj):
-            # Let's finish by rapid to clearance...just for safety
-            self.commandlist.append(Path.Command("G0", {"Z": obj.ClearanceHeight.Value}))
-
         path = Path.Path(self.commandlist)
         obj.Path = path
         obj.CycleTime = self.getCycleTimeEstimate(obj)