Fix a regression in the previous release that caused spurious error message when doing some out of band searches. Fixes #1999936 [IndexError: tuple index out of range](https://bugs.launchpad.net/calibre/+bug/1999936)

src/calibre/gui2/library/models.py

@@ -620,6 +620,13 @@ class BooksModel(QAbstractTableModel):  # {{{
     def current_changed(self, current, previous, emit_signal=True):
         if current.isValid():
             idx = current.row()
+            try:
+                self.db.id(idx)
+            except Exception:
+                # can happen if an out of band search is done causing the index
+                # to no longer be valid since this function is now called after
+                # an event loop tick.
+                return
             try:
                 data = self.get_book_display_info(idx)
             except Exception: