Fix bug that caused error message when automatically sending news to device, if the news had been previously deleted

src/calibre/gui2/main.py

@@ -755,6 +755,7 @@ class Main(MainWindow, Ui_MainWindow):
     def sync_news(self):
         if self.device_connected:
             ids = list(dynamic.get('news_to_be_synced', set([])))
+            ids = [id for id in ids if self.library_view.model().db.has_id(id)]
             files = [self.library_view.model().db.format(id, prefs['output_format'], index_is_id=True, as_file=True) for id in ids]
             files = [f for f in files if f is not None]
             metadata = self.library_view.model().get_metadata(ids, rows_are_ids=True)
@@ -889,6 +890,7 @@ class Main(MainWindow, Ui_MainWindow):
             self.job_exception(job)
             return
         id = self.library_view.model().add_news(pt.name, recipe)
+        self.library_view.model().reset()
         sync = dynamic.get('news_to_be_synced', set([]))
         sync.add(id)
         dynamic.set('news_to_be_synced', sync)

src/calibre/library/database2.py

@@ -232,6 +232,9 @@ class ResultCache(SearchQueryParser):
     def row(self, id):
         return self.index(id)
     
+    def has_id(self, id):
+        return self._data[id] is not None
+    
     def refresh_ids(self, conn, ids):
         for id in ids:
             self._data[id] = conn.get('SELECT * from meta WHERE id=?', (id,))[0]
@@ -371,6 +374,7 @@ class LibraryDatabase2(LibraryDatabase):
         self.index   = self.data.index
         self.refresh_ids = functools.partial(self.data.refresh_ids, self.conn)
         self.row     = self.data.row
+        self.has_id  = self.data.has_id
         
         self.refresh()
         
@@ -589,7 +593,7 @@ class LibraryDatabase2(LibraryDatabase):
                 data = data.read()
             p.loadFromData(data)
             p.save(path)
-            
+    
     def all_formats(self):
         formats = self.conn.get('SELECT format from data')
         if not formats: