CLI: Handle BaseAbsentValues in JSON

Author: ikelos

volatility3/cli/text_renderer.py

@@ -535,10 +535,18 @@ def tab_stop(self, line: str) -> str:
 
 class JsonRenderer(CLIRenderer):
     _type_renderers = {
-        format_hints.HexBytes: lambda x: x.hex(" "),
+        format_hints.HexBytes: lambda x: (
+            x.hex(" ")
+            if not isinstance(x, interfaces.renderers.BaseAbsentValue)
+            else "N/A"
+        ),
         renderers.Disassembly: quoted_optional(display_disassembly),
         format_hints.MultiTypeData: quoted_optional(multitypedata_as_text),
-        renderers.LayerData: lambda x: LayerDataRenderer().render_bytes(x)[0].hex(" "),
+        renderers.LayerData: lambda x: (
+            LayerDataRenderer().render_bytes(x)[0].hex(" ")
+            if not isinstance(x, interfaces.renderers.BaseAbsentValue)
+            else "N/A"
+        ),
         bytes: optional(lambda x: " ".join(f"{b:02x}" for b in x)),
         datetime.datetime: lambda x: (
             x.isoformat()