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[FEAT] Show a warning if user does not exists on a given site

This is a more general solution of T191950

Bug: T191950
Change-Id: Ib2c74c580f22c393b4fee99d53260f2f71d07c06
---
M pywikibot/pagegenerators.py
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/pywikibot/pagegenerators.py b/pywikibot/pagegenerators.py
index 9ecdf2e..684c0f9 100644
--- a/pywikibot/pagegenerators.py
+++ b/pywikibot/pagegenerators.py
@@ -1521,10 +1521,15 @@
     """
     if site is None:
         site = pywikibot.Site()
+
+    user = pywikibot.User(site, username)
+    if not (user.isAnonymous() or user.isRegistered()):
+            pywikibot.warning('User "{}" does not exist on site "{}".'
+                              .format(user.username, site))
+
     return _filter_unique(
-        pywikibot.Page(pywikibot.Link(contrib["title"], source=site))
-        for contrib in site.usercontribs(user=username, namespaces=namespaces,
-                                         total=total)
+        contrib[0]
+        for contrib in user.contributions(namespaces=namespaces, total=total)
     )
 
 

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