[fix] check whether tile exists first

This is a temporary solution for T372106.
FilePage.exists() gives True if the file decription exists even there
is no file at all but file_is_shared() fails with missing imageinfo
exception. We should have a way to check for existing image.

For this special case such files should be delinked.

Bug: T372106
Change-Id: Ieec85c7de50ba65433f2d9731aaf65316fb74c55

scripts/delinker.py

@@ -93,7 +93,7 @@ def init_page(self, item) -> pywikibot.page.FilePage:
     def skip_page(self, page) -> bool:
         """Skip pages which neither exists locally nor on shared repository."""
         pywikibot.info('.', newline=False)
-        if page.file_is_shared() or page.exists():
+        if page.exists() or page.file_is_shared():
             return True
         return super().skip_page(page)