api: Fixed fatal error if Comment.character is null.

rpdata/api/Comment.js

@@ -17,7 +17,7 @@ class Comment {
     this.subject = subject
     this.author = author
     this.characterName = characterName
-    this.character = CommentCharacter.fromData(character)
+    this.character = character != null ? CommentCharacter.fromData(character) : null
     this.fictionalDate = new Date(fictionalDate)
     this.createdDate = new Date(createdDate)
     this.editedDate = new Date(editedDate)