Handle Midgardsormr reliability PK error in fallback (#836)

The edge case fix in #800 for having full storage when trying to
complete the story that gives you Midgardsormr has its own edge case. It
causes a PK error if you somehow already have Midgardsormr - which is
possible via save editing.

DragaliaAPI/DragaliaAPI.Integration.Test/Features/Quest/QuestReadStoryTest.cs

@@ -77,6 +77,49 @@ await this.Client.PostMsgpack<QuestReadStoryResponse>(
             );
     }
 
+    [Fact]
+    public async Task ReadStory_Midgardsormr_DoesNotAddReliabilityIfOwned()
+    {
+        int midgardStoryId = 1000109;
+        this.ApiContext.PlayerUserData.ExecuteUpdate(x =>
+            x.SetProperty(e => e.MaxDragonQuantity, 0)
+        );
+
+        await this.AddToDatabase(
+            new DbPlayerDragonReliability() { DragonId = Dragons.Midgardsormr }
+        );
+
+        QuestReadStoryResponse response = (
+            await this.Client.PostMsgpack<QuestReadStoryResponse>(
+                "/quest/read_story",
+                new QuestReadStoryRequest() { QuestStoryId = midgardStoryId }
+            )
+        ).Data;
+
+        response.UpdateDataList.UserData.Should().NotBeNull();
+
+        response.UpdateDataList.DragonReliabilityList.Should().BeNull();
+
+        response
+            .EntityResult.OverPresentEntityList.Should()
+            .ContainSingle()
+            .Which.Should()
+            .BeEquivalentTo(
+                new AtgenBuildEventRewardEntityList()
+                {
+                    EntityType = EntityTypes.Dragon,
+                    EntityId = (int)Dragons.Midgardsormr,
+                    EntityQuantity = 1,
+                }
+            );
+
+        response
+            .UpdateDataList.QuestStoryList.Should()
+            .ContainEquivalentOf(
+                new QuestStoryList() { QuestStoryId = midgardStoryId, State = StoryState.Read }
+            );
+    }
+
     [Fact]
     public async Task ReadStory_UpdatesDatabase()
     {

DragaliaAPI/DragaliaAPI/Features/Story/StoryService.cs

@@ -268,7 +268,12 @@ out QuestStoryRewardInfo? rewardInfo
                         )
                     );
 
-                    if (reward is { Type: EntityTypes.Dragon, Id: (int)Dragons.Midgardsormr })
+                    if (
+                        reward is { Type: EntityTypes.Dragon, Id: (int)Dragons.Midgardsormr }
+                        && !await apiContext.PlayerDragonReliability.AnyAsync(x =>
+                            x.DragonId == Dragons.Midgardsormr
+                        )
+                    )
                     {
                         // The game doesn't handle it well if you send the Chapter 1 Midgardsormr to the gift box.
                         // You will later be forced to give him a gift in the dragon's roost tutorial, which will fail