Arch: Make sure the BaseMaterial property contains a Material object

src/Mod/Arch/ArchComponent.py

@@ -346,7 +346,12 @@ class Component:
             self.Type = state
 
     def onChanged(self,obj,prop):
-        pass
+        if prop == "BaseMaterial":
+            if hasattr(obj,"BaseMaterial"):
+                if obj.BaseMaterial:
+                    if Draft.getType(obj.BaseMaterial) != "Material":
+                        obj.BaseMaterial = None
+                        print "Removing bad BaseMaterial link in ",obj.Name
 
     def clone(self,obj):
         "if this object is a clone, sets the shape. Returns True if this is the case"

src/Mod/Arch/ArchEquipment.py

@@ -261,6 +261,7 @@ class _Equipment(ArchComponent.Component):
 
     def onChanged(self,obj,prop):
         self.hideSubobjects(obj,prop)
+        ArchComponent.Component.onChanged(self,obj.prop)
 
     def execute(self,obj):
 

src/Mod/Arch/ArchSpace.py

@@ -290,6 +290,7 @@ class _Space(ArchComponent.Component):
                         obj.EquipmentPower = p
         if hasattr(obj,"Area"):
             obj.setEditorMode('Area',1)
+        ArchComponent.Component.onChanged(self,obj.prop)
 
     def addSubobjects(self,obj,subobjects):
         "adds subobjects to this space"

src/Mod/Arch/ArchStructure.py

@@ -577,6 +577,7 @@ class _Structure(ArchComponent.Component):
             if nodes:
                 self.nodes = [v.Point.add(offset) for v in nodes.Vertexes]
                 obj.Nodes = self.nodes
+        ArchComponent.Component.onChanged(self,obj.prop)
 
     def getNodeEdges(self,obj):
         "returns a list of edges from stuctural nodes"

src/Mod/Arch/ArchWindow.py

@@ -688,6 +688,7 @@ class _Window(ArchComponent.Component):
                             # because of load order, but it doesn't harm...
                             pass
                         FreeCAD.ActiveDocument.recompute()
+        ArchComponent.Component.onChanged(self,obj.prop)
 
 
     def execute(self,obj):