Plugins: process spoofing handle none values and set more classmethods

volatility3/framework/plugins/linux/malware/process_spoofing.py

@@ -240,6 +240,8 @@ class ProcessSpoofing(plugins.PluginInterface):
 
                 is_deleted = exe_path.endswith(" (deleted)") if exe_path else False
 
+                # Convert None values to strings for TreeGrid compatibility
+                exe_path_render = exe_path if exe_path else "N/A"
                 cmdline_render = cmdline_basename if cmdline_basename else "N/A"
                 comm_render = comm if comm else "N/A"
 
@@ -248,7 +250,7 @@ class ProcessSpoofing(plugins.PluginInterface):
                     (
                         pid,
                         ppid,
-                        exe_path,
+                        exe_path_render,
                         cmdline_render,
                         comm_render,
                         cmdline_spoofed,