fix: BoundBox exception when inserting BIM section plan into TechDraw. (#13153)

src/Mod/Arch/ArchSectionPlane.py

@@ -542,8 +542,10 @@ def getSVG(source,
 
     # add additional edge symbols from windows
     cutwindows = []
-    if cutface and windows:
-        cutwindows = [w.Name for w in windows if w.Shape.BoundBox.intersect(cutface.BoundBox)]
+    if cutface and windows and BoundBoxValid(cutface.BoundBox):
+        cutwindows = [
+            w.Name for w in windows if BoundBoxValid(w.Shape.BoundBox) and w.Shape.BoundBox.intersect(cutface.BoundBox)
+        ]
     if windows:
         sh = []
         for w in windows:
@@ -576,6 +578,11 @@ def getSVG(source,
     return svg
 
 
+def BoundBoxValid(boundBox)->bool:
+    """Return true if boundBox has a non-zero volume"""
+    return boundBox.XLength > 0 and boundBox.YLength > 0 and boundBox.ZLength > 0
+
+
 def getDXF(obj):
     """Return a DXF representation from a TechDraw view."""
     allOn = getattr(obj, "AllOn", True)