plugin pubsub cache: resync in synchronise when node's sync_state is not set:

synchronisation used to be skipped when the node was existing and `resync` was not set,
however the case happens when a node is subscribed but not synchronised, thus this patch
update the behaviour to be sure to have the node synchronised.

rel 369

sat/plugins/plugin_pubsub_cache.py

@@ -564,7 +564,7 @@ class PubsubCache:
                         f"Unexpected Pubsub event element: {xml_tools.pFmtElt(elt)}"
                     )
             if items:
-                log.debug("caching new items received from {node}")
+                log.debug(f"[{client.profile}] caching new items received from {node}")
                 await self.cacheItems(
                     client, node, items
                 )
@@ -736,7 +736,7 @@ class PubsubCache:
                 analyser=analyse.get("name"),
                 type_=analyse.get("type"),
             )
-        elif not resync:
+        elif not resync and pubsub_node.sync_state is not None:
                 # the node exists, nothing to do
                 return