rewards: sub quests are not affected by luck skill

mhapi/rewards.py

@@ -139,6 +139,10 @@ class QuestReward(object):
             self.skill_delta = 0
         else:
             # variable reward, expected number of draws depends on luck skill
+            if self.slot == stats.QUEST_SUB:
+                # sub quest rewards aren't affected by luck skill in 4U
+                counts = [stats.quest_reward_expected_c(self.slot)]
+            else:
                 counts = [stats.quest_reward_expected_c(self.slot, skill)
                           for skill in xrange(LuckSkill.NONE,
                                               LuckSkill.AMAZING+1)]

mhapi/stats.py

@@ -111,6 +111,9 @@ def quest_reward_expected_c(line=QUEST_A, luck_skill=LUCK_SKILL_NONE):
     elif line == QUEST_SUB:
         min_c = 1
         max_c = 4
+        # luck skill does not work on sub quests, see
+        # https://www.reddit.com/r/MonsterHunter/comments/307sda/fate_doesnt_appear_to_do_anything_to_subquest/
+        extend_p = 22 * 100.0 / 32
     else:
         raise ValueError()