api: Fixed fictionalDate being set to Jan 1 1970 instead of null in Story and Chapter.

rpdata/api/Chapter.js

@@ -16,7 +16,7 @@ class Chapter {
     this.author = author
     this.source = source
     this.createdDate = new Date(createdDate)
-    this.fictionalDate = new Date(fictionalDate)
+    this.fictionalDate = fictionalDate != null ? new Date(fictionalDate) : null
     this.editedDate = new Date(editedDate)
   }
 

rpdata/api/Story.js

@@ -23,7 +23,7 @@ class Story {
     this.category = category
     this.createdDate = new Date(createdDate)
     this.updatedDate = new Date(updatedDate)
-    this.fictionalDate = new Date(fictionalDate)
+    this.fictionalDate = fictionalDate != null ? new Date(fictionalDate) : null
     this.tags = tags.map(dt => new Tag(dt.kind, dt.name))
     this.chapters = chapters != null ? chapters.map(c => new Chapter(c.id, c.title, c.author, c.source, c.createdDate, c.fictionalDate, c.editedDate)) : null
   }