show (end) when exiting with resched=off

anki/sched.py

@@ -1188,7 +1188,7 @@ To study outside of the normal schedule, click the Custom Study button below."""
         "Return the next interval for CARD as a string."
         ivl = self.nextIvl(card, ease)
         if not ivl:
-            return ""
+            return _("(end)")
         s = fmtTimeSpan(ivl, short=short)
         if ivl < self.col.conf['collapseTime']:
             s = "<"+s

tests/test_sched.py

@@ -682,7 +682,7 @@ def test_cram_resched():
     assert ni(c, 1) == 60
     assert ni(c, 2) == 600
     assert ni(c, 3) == 0
-    assert d.sched.nextIvlStr(c, 3) == ""
+    assert d.sched.nextIvlStr(c, 3) == "(end)"
     d.sched.answerCard(c, 3)
     assert c.queue == c.type == 0
     # undue reviews should also be unaffected