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[fix] Don't show wrong empty generator message in category.py

Bug: T196871
Change-Id: I94be5d408691c0ce35a59a27081b5ec2e5ae78d6
---
M pywikibot/bot.py
M scripts/category.py
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pywikibot/bot.py b/pywikibot/bot.py
index 1557b9d..0a65ca4 100644
--- a/pywikibot/bot.py
+++ b/pywikibot/bot.py
@@ -1210,6 +1210,7 @@
 
         self._treat_counter = 0
         self._save_counter = 0
+        self._generator_completed = False
 
     @property
     def current_page(self):
@@ -1509,6 +1510,8 @@
                         '\n%s: page count reached Python 2 sys.maxint (%d).\n'
                         'Python 3 should be used to process very large batches'
                         % (self.__class__.__name__, sys.maxint))
+            else:
+                self._generator_completed = True
         except QuitKeyboardInterrupt:
             pywikibot.output('\nUser quit %s bot run...' %
                              self.__class__.__name__)
diff --git a/scripts/category.py b/scripts/category.py
index efaeee6..35d53dd 100755
--- a/scripts/category.py
+++ b/scripts/category.py
@@ -1215,7 +1215,7 @@
 
     def teardown(self):
         """Cleanups after run operation."""
-        if not self._treat_counter:
+        if self._generator_completed and not self._treat_counter:
             pywikibot.output('There are no pages or files in category {}'
                              .format(self.cat_title))
 

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