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[bugfix] Enable replacements with bool(replacements) is False to be imported

If a replacement is given with _add_deprecated_attr method and its
boolean result is false it cannot be imported and an ImportError occurs:
ImportError: cannot import name '<replacement>' from '<module>'.
Therefore check whether a replacement was given explicitly.

Change-Id: I1158e83c8a40857766d43158e636412701ae6b74
---
M pywikibot/tools/__init__.py
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pywikibot/tools/__init__.py b/pywikibot/tools/__init__.py
index cfa3859..877d447 100644
--- a/pywikibot/tools/__init__.py
+++ b/pywikibot/tools/__init__.py
@@ -1886,7 +1886,7 @@
             warn(warning_message.format(self._module.__name__, attr, name),
                  FutureWarning if future else DeprecationWarning, 2)
 
-            if repl:
+            if repl is not None:
                 return repl
 
             if '.' in name:

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