Skip rebar shape to be subtracted from structure

To fix issue:
amrit3701/FreeCAD-Reinforcement#81

And it eventually will fix issue of this thread:
https://forum.freecadweb.org/viewtopic.php?f=23&t=49481

src/Mod/Arch/ArchComponent.py

@@ -758,7 +758,7 @@ def processSubShapes(self,obj,base,placement=None):
                 for host in link.Hosts:
                     if host == obj:
                         subs.append(link)
-            elif hasattr(link,"Host"):
+            elif hasattr(link,"Host") and Draft.getType(link) != "Rebar":
                 if link.Host == obj:
                     subs.append(link)
         for o in subs: