Revert "fix(spec): always show thumb in topic response"

This reverts commit 493c568a75.

public/openapi/components/schemas/PostObject.yaml

@@ -74,9 +74,6 @@ PostObject:
           description: A category identifier
         slug:
           type: string
-        thumb:
-          type: string
-          description: An uploaded topic thumbnail
         deleted:
           type: number
         postcount:

public/openapi/components/schemas/TopicObject.yaml

@@ -41,9 +41,6 @@ TopicObject:
       type: number
     locked:
       type: number
-    thumb:
-      type: string
-      description: An uploaded topic thumbnail
     pinned:
       type: number
       description: Whether or not this particular topic is pinned to the top of the
@@ -224,6 +221,8 @@ TopicObject:
         description: HTML injected into the theme
     index:
       type: number
+    thumb:
+      type: string
   required:
     - tid
     - uid

public/openapi/read/topic/tid/id.yaml

@@ -42,9 +42,6 @@ get:
                 type: number
               viewcount:
                 type: number
-              thumb:
-                type: string
-                description: An uploaded topic thumbnail
               deleted:
                 type: number
               locked:

public/openapi/read/topic/topic_id.yaml

@@ -53,9 +53,6 @@ get:
                     type: number
                   viewcount:
                     type: number
-                  thumb:
-                    type: string
-                    description: An uploaded topic thumbnail
                   postercount:
                     type: number
                     description: The number of unique users who made a post in this topic

public/openapi/read/unread.yaml

@@ -49,9 +49,6 @@ get:
                           type: number
                         viewcount:
                           type: number
-                        thumb:
-                          type: string
-                          description: An uploaded topic thumbnail
                         postercount:
                           type: number
                         teaserPid:

src/topics/data.js

@@ -98,7 +98,9 @@ function modifyTopic(topic, fields) {
 
 	escapeTitle(topic);
 
-	topic.thumb = validator.escape(String(topic.thumb)) || '';
+	if (topic.hasOwnProperty('thumb')) {
+		topic.thumb = validator.escape(String(topic.thumb));
+	}
 
 	if (topic.hasOwnProperty('timestamp')) {
 		topic.timestampISO = utils.toISOString(topic.timestamp);