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[IMPR] ignore first empty warning of EventStreams

Bug: T244491
Change-Id: I6d7dfc2a2f0a77daf73ef1ce196b6ae52fd7855f
---
M pywikibot/comms/eventstreams.py
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/pywikibot/comms/eventstreams.py b/pywikibot/comms/eventstreams.py
index be5af0a..668c9b0 100644
--- a/pywikibot/comms/eventstreams.py
+++ b/pywikibot/comms/eventstreams.py
@@ -9,8 +9,8 @@
     pip install sseclient
 """
 #
-# (C) xqt, 2017-2018
-# (C) Pywikibot team, 2017-2019
+# (C) xqt, 2017-2020
+# (C) Pywikibot team, 2017-2020
 #
 # Distributed under the terms of the MIT license.
 #
@@ -285,6 +285,7 @@
         """Iterator."""
         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)
@@ -316,8 +317,10 @@
                         if self.streamfilter(element):
                             n += 1
                             yield element
-                else:
+                elif not ignore_first_empty_warning:
                     warning('Empty message found.')
+                else:
+                    ignore_first_empty_warning = False
             elif event.event == 'error':
                 warning('Encountered error: {0}'.format(event.data))
             else:

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