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pagegenerators.py: -linter options fails

Fix parsing of argument in handleArg()
-linter should select all categories instead gives error.

Bug: T187945
Change-Id: I462ef0c7f32a1a519f9d7f394372aaa6e93d3bf4
---
M pywikibot/pagegenerators.py
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/pywikibot/pagegenerators.py b/pywikibot/pagegenerators.py
index ab4ed51..bbad63c 100644
--- a/pywikibot/pagegenerators.py
+++ b/pywikibot/pagegenerators.py
@@ -14,7 +14,7 @@
 &params;
 """
 #
-# (C) Pywikibot team, 2008-2017
+# (C) Pywikibot team, 2008-2018
 #
 # Distributed under the terms of the MIT license.
 #
@@ -719,6 +719,7 @@
             cats = self.site.siteinfo.get('linter')  # Get linter categories.
             valid_cats = [c for _list in cats.values() for c in _list]
 
+            value = '' if value is None else value
             cat, sep, lint_from = value.partition('/')
             if not lint_from:
                 lint_from = None

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