Suppress misleading "not found" log when version was captured

After 0c9af7c the parser kept scanning past the SERVER_SESSION_VERSION
attribute (so it could also grab ObjectVariableTypeName for the V2
legitimation), which made the trailing "ServerSessionVersion not found"
debug fire on every successful capture. Gate it on the captured fields
so it only fires when we actually didn't find it.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: gijzelaerr

s7/connection.py

@@ -990,7 +990,8 @@ def _parse_create_object_response(self, payload: bytes) -> None:
                 # Unknown tag - try to skip
                 offset += 1
 
-        logger.debug("ServerSessionVersion not found in CreateObject response")
+        if self._server_session_version_raw is None and self._server_session_version is None:
+            logger.debug("ServerSessionVersion not found in CreateObject response")
 
     def _skip_typed_value(self, data: bytes, offset: int, datatype: int, flags: int) -> int:
         """Skip over a typed value in the PObject tree.