find&replace should ignore notes without provided field

anki/find.py

@@ -412,8 +412,12 @@ def findReplace(col, nids, src, dst, regex=False, field=None, fold=True):
         # does it match?
         sflds = splitFields(flds)
         if field:
-            ord = mmap[str(mid)]
-            sflds[ord] = repl(sflds[ord])
+            try:
+                ord = mmap[str(mid)]
+                sflds[ord] = repl(sflds[ord])
+            except KeyError:
+                # note doesn't have that field
+                continue
         else:
             for c in range(len(sflds)):
                 sflds[c] = repl(sflds[c])

anki/sched.py

@@ -842,7 +842,6 @@ did = ?, queue = %s, due = ?, mod = ?, usn = ? where id = ?""" % queue, data)
             perDay=self.reportLimit
         )
 
-
     def _lapseConf(self, card):
         conf = self._cardConf(card)
         # normal deck