fix(oas31): render responses with empty content field (#9664)

Refs #9199

src/core/components/response.jsx

@@ -8,20 +8,16 @@ import { getKnownSyntaxHighlighterLanguage } from "core/utils/jsonParse"
 
 
 const getExampleComponent = ( sampleResponse, HighlightCode, getConfigs ) => {
-  if (
-    sampleResponse !== undefined &&
-    sampleResponse !== null
-  ) {
-    let language = null
-    let testValueForJson = getKnownSyntaxHighlighterLanguage(sampleResponse)
-    if (testValueForJson) {
-      language = "json"
-    }
-    return <div>
+  if (sampleResponse == null) return null
+
+  const testValueForJson = getKnownSyntaxHighlighterLanguage(sampleResponse)
+  const language = testValueForJson ? "json" : null
+
+  return (
+    <div>
       <HighlightCode className="example" getConfigs={ getConfigs } language={ language } value={ stringify(sampleResponse) } />
     </div>
-  }
-  return null
+  )
 }
 
 export default class Response extends React.Component {
@@ -171,7 +167,7 @@ export default class Response extends React.Component {
       shouldOverrideSchemaExample ? mediaTypeExample : undefined
     )
 
-    let example = getExampleComponent( sampleResponse, HighlightCode, getConfigs )
+    const example = getExampleComponent( sampleResponse, HighlightCode, getConfigs )
 
     return (
       <tr className={ "response " + ( className || "") } data-code={code}>

src/core/plugins/json-schema-2020-12-samples/fn/main.js

@@ -21,6 +21,9 @@ export const sampleFromSchemaGeneric = (
   exampleOverride = undefined,
   respectXML = false
 ) => {
+  // there is nothing to generate schema from
+  if (schema == null && exampleOverride === undefined) return undefined
+
   if (typeof schema?.toJS === "function") schema = schema.toJS()
   schema = typeCast(schema)
 

src/core/plugins/oas31/after-load.js

@@ -27,6 +27,10 @@ function afterLoad({ fn, getSystem }) {
         createXMLExample: fn.jsonSchema202012.createXMLExample,
         memoizedSampleFromSchema: fn.jsonSchema202012.memoizedSampleFromSchema,
         memoizedCreateXMLExample: fn.jsonSchema202012.memoizedCreateXMLExample,
+        getJsonSampleSchema: fn.jsonSchema202012.getJsonSampleSchema,
+        getYamlSampleSchema: fn.jsonSchema202012.getYamlSampleSchema,
+        getXmlSampleSchema: fn.jsonSchema202012.getXmlSampleSchema,
+        getSampleSchema: fn.jsonSchema202012.getSampleSchema,
       },
       getSystem()
     )