don't genCards() into a cram deck

anki/collection.py

@@ -318,6 +318,10 @@ crt=?, mod=?, scm=?, dty=?, usn=?, ls=?, conf=?""",
             for t in self._tmplsFromOrds(model, avail):
                 doHave = nid in have and t['ord'] in have[nid]
                 if not doHave:
+                    # check deck is not a cram deck
+                    did = t['did'] or did
+                    if self.decks.isDyn(did):
+                        did = 1
                     # we'd like to use the same due# as sibling cards, but we
                     # can't retrieve that quickly, so we give it a new id
                     # instead

anki/decks.py

@@ -417,3 +417,6 @@ class DeckManager(object):
         did = self.id(name, type=defaultDynamicDeck)
         self.select(did)
         return did
+
+    def isDyn(self, did):
+        return self.get(did)['dyn']