Fix structural problems with the openapi spec (#22256)

* Fix structural problems with the openapi spec

* Fix array issue for items

spec/requests/api/schemas/json/category_create_request.json

@@ -42,7 +42,7 @@
     },
     "form_template_ids": {
       "type": "array",
-      "items": []
+      "items": {}
     }
   },
   "required": [

spec/requests/api/schemas/json/category_create_response.json

@@ -76,7 +76,7 @@
         },
         "form_template_ids": {
           "type": "array",
-          "items": []
+          "items": {}
         },
         "has_children": {
           "type": [

spec/requests/api/schemas/json/category_update_response.json

@@ -79,7 +79,7 @@
         },
         "form_template_ids": {
           "type": "array",
-          "items": []
+          "items": {}
         },
         "has_children": {
           "type": [

spec/requests/api/schemas/json/post_show_response.json

@@ -126,8 +126,7 @@
     },
     "actions_summary": {
       "type": "array",
-      "items": [
-        {
+      "items": {
         "type": "object",
         "additionalProperties": false,
         "properties": {
@@ -152,7 +151,6 @@
           "id"
         ]
       }
-      ]
     },
     "moderator": {
       "type": "boolean"
@@ -207,9 +205,7 @@
     },
     "mentioned_users": {
       "type": "array",
-      "items": [
-
-      ]
+      "items": {}
     },
     "name": {
       "type": [

spec/requests/api/schemas/json/post_update_response.json

@@ -130,8 +130,7 @@
         },
         "actions_summary": {
           "type": "array",
-          "items": [
-            {
+          "items": {
             "type": "object",
             "additionalProperties": false,
             "properties": {
@@ -147,7 +146,6 @@
               "can_act"
             ]
           }
-          ]
         },
         "moderator": {
           "type": "boolean"
@@ -205,9 +203,7 @@
         },
         "mentioned_users": {
           "type": "array",
-          "items": [
-
-          ]
+          "items": {}
         },
         "name": {
           "type": [

spec/requests/api/schemas/json/site_response.json

@@ -712,7 +712,7 @@
             },
             "form_template_ids": {
               "type": "array",
-              "items": []
+              "items": {}
             }
           },
           "required": [