tests: ignore empty message warning in eventstreams.py

Bug: T383035
Change-Id: I7fc393df0c868e533b0bf512ef6939b51a70269f

Author: xqt

pywikibot/comms/eventstreams.py

@@ -9,7 +9,7 @@
 .. versionadded:: 3.0
 """
 #
-# (C) Pywikibot team, 2017-2024
+# (C) Pywikibot team, 2017-2025
 #
 # Distributed under the terms of the MIT license.
 #
@@ -324,7 +324,6 @@ def generator(self):
         """
         n = 0
         event = None
-        ignore_first_empty_warning = True
         while self._total is None or n < self._total:
             if not hasattr(self, 'source'):
                 self.source = EventSource(**self.sse_kwargs)
@@ -355,10 +354,7 @@ def generator(self):
                         if self.streamfilter(element):
                             n += 1
                             yield element
-                elif not ignore_first_empty_warning:
-                    warning('Empty message found.')
-                else:
-                    ignore_first_empty_warning = False
+                # else: ignore empty message
             elif event.event == 'error':
                 warning(f'Encountered error: {event.data}')
             else: