[cleanup] Raise a TypeError if BaseBot.init_page return None

Change-Id: I467753707f36e7961c03ff01267f52982064b39f
---
M pywikibot/bot.py
1 file changed, 1 insertion(+), 9 deletions(-)

diff --git a/pywikibot/bot.py b/pywikibot/bot.py
index 2777fad6..b8df65d 100644
--- a/pywikibot/bot.py
+++ b/pywikibot/bot.py
@@ -1575,15 +1575,7 @@
         try:
             for item in self.generator:
                 # preprocessing of the page
-                initialized_page = self.init_page(item)
-                if initialized_page is None:
-                    issue_deprecation_warning(
-                        'Returning None from init_page() method',
-                        'return a pywikibot.page.BasePage object',
-                        since='20200406')
-                    page = item
-                else:
-                    page = initialized_page
+                page = self.init_page(item)
 
                 # validate page type
                 if not isinstance(page, self.treat_page_type):

