jenkins-bot submitted this change.

Approvals:
  Xqt: Looks good to me, approved
  Matěj Suchánek: Looks good to me, but someone else must approve
  jenkins-bot: Verified

[IMPR] use a sentinel variable to determine the end of an iterable

This enables None to be part of the iterables chain

Change-Id: I76e770735fc1e92fa5cd448751d3da645123760a
---
M pywikibot/tools/__init__.py
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pywikibot/tools/__init__.py b/pywikibot/tools/__init__.py
index f81ee0b..52b40ff 100644
--- a/pywikibot/tools/__init__.py
+++ b/pywikibot/tools/__init__.py
@@ -1029,9 +1029,11 @@
     :return: the combined generator of iterables
     :rtype: generator
     """
+    sentinel = object()
     return (item
-            for item in itertools.chain.from_iterable(zip_longest(*iterables))
-            if item is not None)
+            for item in itertools.chain.from_iterable(
+                zip_longest(*iterables, fillvalue=sentinel))
+            if item is not sentinel)
 
 
 def filter_unique(iterable, container=None, key=None, add=None):

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