Fix #7491 (Error after subscribing to TidBITS: Mac News... news source)

src/calibre/gui2/device.py

@@ -1014,7 +1014,13 @@ def emails_sent(self, results, remove=[]):
             self.status_bar.show_message(_('Sent by email:') + ', '.join(good),
                     5000)
             if remove:
-                self.library_view.model().delete_books_by_id(remove)
+                try:
+                    self.library_view.model().delete_books_by_id(remove)
+                except:
+                    # Probably the user deleted the files, in any case, failing
+                    # to delete the book is not catastrophic
+                    traceback.print_exc()
+
 
     def cover_to_thumbnail(self, data):
         ht = self.device_manager.device.THUMBNAIL_HEIGHT \

src/calibre/library/caches.py

@@ -625,7 +625,11 @@ def set_search_restriction(self, s):
     # }}}
 
     def remove(self, id):
-        self._data[id] = None
+        try:
+            self._data[id] = None
+        except IndexError:
+            # id is out of bounds, no point setting it to None anyway
+            pass
         try:
             self._map.remove(id)
         except ValueError: