[bugfix] Handle 'mark for deletion' of ItemPage.delete()

Bug: T134563
Change-Id: I06660a1d8750ffce3cf9317afad91daac7e1a5bc
---
M pywikibot/page.py
1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/pywikibot/page.py b/pywikibot/page.py
index d8f63fc..570cb6a 100644
--- a/pywikibot/page.py
+++ b/pywikibot/page.py
@@ -1910,8 +1910,15 @@
                     self.site._noMarkDeletePrompt = True
             if answer == 'y':
                 template = '{{delete|1=%s}}\n' % reason
-                self.text = template + self.text
-                return self.save(summary=reason)
+                # We can't add templates in a wikidata item, so let's use its
+                # talk page
+                if isinstance(self, pywikibot.ItemPage):
+                    talk = self.toggleTalkPage()
+                    talk.text = template + talk.text
+                    talk.save(summary=reason)
+                else:
+                    self.text = template + self.text
+                    self.save(summary=reason)
 
     @deprecated_args(step=None)
     def loadDeletedRevisions(self, total=None):
