Windows Registry: Handle possible exception in get_node

Encountered a `SwappedInvalidAddressException` within the call to `cast`
due to an underlying call to `read`.

volatility3/framework/layers/registry.py

@@ -140,7 +140,14 @@ class RegistryHive(linear.LinearlyMappedLayer):
         """Returns the appropriate Node, interpreted from the Cell based on its
         Signature."""
         cell = self.get_cell(cell_offset)
-        signature = cell.cast("string", max_length=2, encoding="latin-1")
+        try:
+            signature = cell.cast("string", max_length=2, encoding="latin-1")
+        except exceptions.InvalidAddressException:
+            vollog.debug(
+                f"Unable to read cell signature for cell at {cell.vol.offset:x}"
+            )
+            return cell
+
         if signature == "nk":
             return cell.u.KeyNode
         elif signature == "sk":