properties: Defensive measures

Author: arfbtwn

src/ExportObject.cs

@@ -70,7 +70,7 @@ public MethodCaller GetPropertyAllCall (string iface)
 
 			if (null == calls.All) {
 				Type it = Mapper.GetInterfaceType (ObjectType, iface);
-				calls.All = TypeImplementer.GenGetAllCall (it);
+				calls.All = null == it ? null : TypeImplementer.GenGetAllCall (it);
 			}
 
 			return calls.All;
@@ -258,7 +258,17 @@ private void HandlePropertyCall (MessageContainer method_call)
 			if ("GetAll" == method_call.Member) {
 				Signature asv = Signature.MakeDict (Signature.StringSig, Signature.VariantSig);
 
-				MethodCaller call = typeMembers [Object.GetType ()].GetPropertyAllCall (face);
+				MethodCaller call = null;
+
+				try {
+					call = typeMembers [Object.GetType ()].GetPropertyAllCall (face);
+				}
+				catch { }
+
+				if (null == call) {
+					conn.MaybeSendUnknownMethodError (method_call);
+					return;
+				}
 
 				Exception ex = null;
 				try {