Handle InvalidAddressException in volshell value display (thanks @atcuno!)

Details:
    Implements exception handling for InvalidAddressException in volshell.
    Ensures invalid pointers don't cause large stack traces, displaying "N/A" instead.

Author: eve-mem

volatility3/cli/volshell/generic.py

@@ -502,6 +502,10 @@ def display_type(
                 len_typename = len(member_type_name)
                 if isinstance(volobject, interfaces.objects.ObjectInterface):
                     # We're an instance, so also display the data
+                    try:
+                        value = self._display_value(getattr(volobject, member))
+                    except exceptions.InvalidAddressException:
+                        value = self._display_value(renderers.NotAvailableValue())
                     print(
                         "    " * dereference_count,
                         " " * (longest_offset - len_offset),
@@ -513,7 +517,7 @@ def display_type(
                         member_type_name,
                         " " * (longest_typename - len_typename),
                         "  ",
-                        self._display_value(getattr(volobject, member)),
+                        value,
                     )
                 else:
                     # not provided with an actual object, nor an offset so just display the types
@@ -585,7 +589,9 @@ def _display_simple_type(
 
     def _display_value(self, value: Any) -> str:
         try:
-            if isinstance(value, objects.Pointer):
+            if isinstance(value, interfaces.renderers.BaseAbsentValue):
+                return "N/A"
+            elif isinstance(value, objects.Pointer):
                 # show pointers in hex to match output for struct addrs
                 # highlight null or unreadable pointers
                 if value == 0: