Small improvements of OpenLineageClient.emit

* Do not print debug message "client will emit event" if event is filtered out
* Do not fail if transport is not set up if event is ignored
* Update annotations a bit

Signed-off-by: Maxim Martynov <martinov_m_s_@mail.ru>

client/python/openlineage/client/client.py

@@ -86,20 +86,20 @@ def _initialize_url(
             ),
         )
 
-    def emit(self, event: Union[RunEvent, DatasetEvent | JobEvent]) -> None:  # noqa: UP007
+    def emit(self, event: RunEvent | DatasetEvent | JobEvent) -> None:
         if not (isinstance(event, (RunEvent, DatasetEvent, JobEvent))):
             msg = "`emit` only accepts RunEvent, DatasetEvent, JobEvent classes"
             raise ValueError(msg)  # noqa: TRY004
+        if self._filters and self.filter_event(event) is None:
+            return
         if not self.transport:
             log.error("Tried to emit OpenLineage event, but transport is not configured.")
             return
+
         if log.isEnabledFor(logging.DEBUG):
             val = Serde.to_json(event).encode("utf-8")
             log.debug("OpenLineageClient will emit event %s", val)
-        if self._filters and self.filter_event(event) is None:
-            return
-        if event:
-            self.transport.emit(event)
+        self.transport.emit(event)
 
     @classmethod
     def from_environment(cls: type[_T]) -> _T:
@@ -112,8 +112,8 @@ def from_dict(cls: type[_T], config: dict[str, str]) -> _T:
 
     def filter_event(
         self,
-        event: Union[RunEvent, DatasetEvent, JobEvent],  # noqa: UP007
-    ) -> Union[RunEvent, DatasetEvent, JobEvent] | None:  # noqa: UP007
+        event: RunEvent | DatasetEvent | JobEvent,
+    ) -> RunEvent | DatasetEvent | JobEvent | None:
         """Filters jobs according to config-defined events"""
         for _filter in self._filters:
             if isinstance(event, RunEvent) and _filter.filter_event(event) is None: