Handle module file being non-str type in python agent.

PiperOrigin-RevId: 268031522
Change-Id: I06557c6191847b2433cde2f49116a4b16ddbcf13

Author: Louis Ye

src/googleclouddebugger/imphook2.py

@@ -422,6 +422,8 @@ def GetModuleFromName(name, path):
       mod_file = getattr(module, '__file__', None)
       if not mod_file:
         continue
+      if not isinstance(mod_file, str):
+        continue
 
       mod_root = os.path.splitext(mod_file)[0]