fix: satisfy Redocly nullable validation

Author: KARSE22

.redocly.yaml

@@ -4,7 +4,7 @@ rules:
   boolean-parameter-prefixes: off
   no-invalid-media-type-examples:
     severity: warn
-    disallowAdditionalProperties: false
+    allowAdditionalProperties: true
   no-enum-type-mismatch: off
 theme:
   openapi:

resources/booklets/models/booklet_generated_base.yml

@@ -51,9 +51,10 @@ allOf:
         $ref: "../attributes/booklet_source_material.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true
 
       object:
         type: string

resources/checks/models/check.yml

@@ -86,9 +86,10 @@ allOf:
         $ref: "../../../shared/attributes/status.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true
 
       object:
         type: string

resources/letters/models/letter_generated_base.yml

@@ -42,9 +42,10 @@ allOf:
         $ref: "../../../shared/attributes/status.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true
 
       object:
         type: string

resources/postcards/models/postcard.yml

@@ -65,9 +65,10 @@ allOf:
         $ref: "../../../shared/attributes/status.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true
 
       object:
         type: string

resources/self_mailers/models/self_mailer.yml

@@ -74,6 +74,7 @@ allOf:
         $ref: "../../../shared/attributes/campaign_id.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true

resources/snap_packs/models/snap_pack.yml

@@ -74,9 +74,10 @@ allOf:
         $ref: "../../../shared/attributes/campaign_id.yml"
 
       failure_reason:
+        type: object
+        nullable: true
         allOf:
           - $ref: "../../../shared/models/failure_reason/failure_reason.yml"
-          - nullable: true
 
       color:
         $ref: "../attributes/color.yml"