silently ignore attempt to delete default deck

users can nest the default deck, so we don't want to throw an error when they
delete a top level deck which the default deck happens to be under

anki/decks.py

@@ -134,7 +134,8 @@ class DeckManager(object):
 
     def rem(self, did, cardsToo=False, childrenToo=True):
         "Remove the deck. If cardsToo, delete any cards inside."
-        assert str(did) != '1'
+        if str(did) == '1':
+            return
         # log the removal regardless of whether we have the deck or not
         self.col._logRem([did], REM_DECK)
         # do nothing else if doesn't exist

tests/test_decks.py

@@ -43,8 +43,6 @@ def test_basic():
 
 def test_remove():
     deck = getEmptyDeck()
-    # can't remove the default deck
-    assertException(AssertionError, lambda: deck.decks.rem(1))
     # create a new deck, and add a note/card to it
     g1 = deck.decks.id("g1")
     f = deck.newNote()