Draft: fix LGTM 'Testing for None should use the 'is' operator' alerrts

https://lgtm.com/projects/g/FreeCAD/FreeCAD/alerts/?mode=tree&ruleFocus=7900090

src/Mod/Draft/draftfunctions/draftify.py

@@ -70,7 +70,7 @@ def draftify(objectslist, makeblock=False, delete=True):
             for cluster in Part.sortEdges(obj.Shape.Edges):
                 w = Part.Wire(cluster)
                 nobj = draftify_shape(w)
-                if nobj == None:
+                if nobj is None:
                     nobj = App.ActiveDocument.addObject("Part::Feature", obj.Name)
                     nobj.Shape = w
                 newobjlist.append(nobj)

src/Mod/Draft/draftgeoutils/geometry.py

@@ -465,7 +465,7 @@ def calculatePlacement(shape):
     pos = shape.BoundBox.Center
     norm = get_normal(shape)
     # for backward compatibility with previous getNormal implementation
-    if norm == None:
+    if norm is None:
         norm = App.Vector(0, 0, 1)
     pla = App.Placement()
     pla.Base = pos

src/Mod/Draft/draftgeoutils/offsets.py

@@ -233,7 +233,7 @@ def offsetWire(wire, dvec, bind=False, occ=False,
     else:
         norm = get_normal(wire)  # norm = Vector(0, 0, 1)
         # for backward compatibility with previous getNormal implementation
-        if norm == None:
+        if norm is None:
             norm = App.Vector(0, 0, 1)
 
     closed = isReallyClosed(wire)

src/Mod/Draft/draftgeoutils/wires.py

@@ -160,7 +160,7 @@ def flattenWire(wire):
     """Force a wire to get completely flat along its normal."""
     n = get_normal(wire)
     # for backward compatibility with previous getNormal implementation
-    if n == None:
+    if n is None:
         n = App.Vector(0, 0, 1)
 
     o = wire.Vertexes[0].Point

src/Mod/Draft/draftmake/make_line.py

@@ -39,7 +39,7 @@ def make_line(first_param, last_param=None):
     Parameters
     ----------
     first_param : 
-        Base.Vector -> First point of the line (if p2 == None)
+        Base.Vector -> First point of the line (if p2 is None)
         Part.LineSegment -> Line is created from the given Linesegment
         Shape -> Line is created from the give Shape
 

src/Mod/Draft/draftobjects/patharray.py

@@ -446,7 +446,7 @@ def placements_on_path(shapeRotation, pathwire, count, xlate, align,
     closedpath = DraftGeomUtils.isReallyClosed(pathwire)
     normal = DraftGeomUtils.get_normal(pathwire)
     # for backward compatibility with previous getNormal implementation
-    if normal == None:
+    if normal is None:
         normal = App.Vector(0, 0, 1)
 
     if forceNormal and normalOverride: