fail gracefully if id doesn't exist

anki/cards.py

@@ -149,6 +149,8 @@ class Card(object):
     def fromDB(self, s, id):
         r = s.first("select * from cards where id = :id",
                     id=id)
+        if not r:
+            return
         (self.id,
          self.factId,
          self.cardModelId,
@@ -187,6 +189,7 @@ class Card(object):
          self.isDue,
          self.type,
          self.combinedDue) = r
+        return True
 
     def toDB(self, s):
         "Write card to DB. Note that isDue assumes card is not spaced."

anki/deck.py

@@ -205,10 +205,13 @@ Caller is responsible for ensuring cards are not spaced."""
         "Given a card ID, return a card, and start the card timer."
         if orm:
             card = self.s.query(anki.cards.Card).get(id)
+            if not card:
+                return
             card.timerStopped = False
         else:
             card = anki.cards.Card()
-            card.fromDB(self.s, id)
+            if not card.fromDB(self.s, id):
+                return
         card.genFuzz()
         card.startTimer()
         return card