component AP gateway: log a warning instead of raising an exception in onMessage:

if something goes wrong, a warning is logged instead of raising a failing in `onMessage`'s
`get_ap_actor_id_from_account` and `sign_and_post` calls.

libervia/backend/plugins/plugin_comp_ap_gateway/__init__.py

@@ -2277,7 +2277,14 @@ class APGateway:
             return mess_data
 
         actor_account = self._e.unescape(mess_data["to"].user)
-        actor_id = await self.get_ap_actor_id_from_account(actor_account)
+        try:
+            actor_id = await self.get_ap_actor_id_from_account(actor_account)
+        except Exception as e:
+            log.warning(
+                f"Can't retrieve data on actor {actor_account}: {e}"
+            )
+            # TODO: send an error <message>
+            return mess_data
         inbox = await self.get_ap_inbox_from_id(actor_id, use_shared=False)
 
         try:
@@ -2313,7 +2320,13 @@ class APGateway:
             "name": f"@{actor_account}",
         })
 
-        await self.sign_and_post(inbox, ap_item["actor"], ap_item)
+        try:
+            await self.sign_and_post(inbox, ap_item["actor"], ap_item)
+        except Exception as e:
+            # TODO: send an error <message>
+            log.warning(
+                f"Can't send message to {inbox}: {e}"
+            )
         return mess_data
 
     async def _on_message_retract(