Mac: Fix bug found by buildbot/npetroni due refactoring

volatility3/framework/symbols/mac/extensions/__init__.py

@@ -28,8 +28,11 @@ class proc(generic.GenericIntelProcess):
         if not isinstance(parent_layer, interfaces.layers.TranslationLayerInterface):
             raise TypeError("Parent layer is not a translation layer, unable to construct process layer")
 
-        with contextlib.suppress(exceptions.InvalidAddressException):
+        try:
             dtb = self.get_task().map.pmap.pm_cr3
+        except exceptions.InvalidAddressException:
+            # Bail out because we couldn't find the DTB
+            return None
 
         if preferred_name is None:
             preferred_name = self.vol.layer_name + f"_Process{self.p_pid}"