Avoid attr-err when `._ipc_msg==None`

Seems this can happen in particular when we raise a `MessageTypeError`
on the sender side of a `Context`, since there isn't any msg relayed
from the other side (though i'm wondering if MTE should derive from RAE
then considering this case?).

Means `RemoteActorError.boxed_type = None` in such cases instead of
raising an attr-error for the `None.boxed_type_str`.

tractor/_exceptions.py

@@ -432,9 +432,13 @@ class RemoteActorError(Exception):
         Error type boxed by last actor IPC hop.
 
         '''
-        if self._boxed_type is None:
+        if (
+            self._boxed_type is None
+            and
+            (ipc_msg := self._ipc_msg)
+        ):
             self._boxed_type = get_err_type(
-                self._ipc_msg.boxed_type_str
+                ipc_msg.boxed_type_str
             )
 
         return self._boxed_type
@@ -1144,6 +1148,12 @@ def unpack_error(
 
     '''
     if not isinstance(msg, Error):
+        # log.critical(
+        #     f'Why a non-Error !?\n'
+        #     f'{msg}\n'
+        # )
+        # dun work without gb-portal!
+        # breakpoint()
         return None
 
     # try to lookup a suitable error type from the local runtime