fix: avoid rendering empty response schemas (#9667)

Refs #9666
Co-authored-by: Pierre Paysant-Le Roux <ppaysant@gmail.com>

test/e2e-cypress/e2e/features/default-model-rendering.cy.js

@@ -0,0 +1,39 @@
+/**
+ * @prettier
+ */
+
+describe("defaultModelRendering set to model", () => {
+  it("should not render schemas for responses with no defined schemas", () => {
+    cy.visit(
+      "/?defaultModelRendering=model&url=/documents/features/default-model-rendering.yaml"
+    )
+      .get("#operations-default-get_")
+      .click()
+      .get(
+        "#operations-default-get_ [data-code=200] .response-col_description__inner"
+      )
+      .contains("no content")
+      .get("#operations-default-get_ [data-code=200] .model-example")
+      .should("not.exist")
+      .get(
+        "#operations-default-get_ [data-code=201] .response-col_description__inner"
+      )
+      .contains("no schema but an example")
+      .get("#operations-default-get_ [data-code=201] .model-example")
+      .contains('"foo": "bar"')
+      .should("exist")
+      .get(
+        "#operations-default-get_ [data-code=202] .response-col_description__inner"
+      )
+      .contains("no schema but examples")
+      .get("#operations-default-get_ [data-code=202] .model-example")
+      .contains('"foo": "bar"')
+      .should("exist")
+      .get(
+        "#operations-default-get_ [data-code=203] .response-col_description__inner"
+      )
+      .contains("no schema no example")
+      .get("#operations-default-get_ [data-code=203] .model-example")
+      .should("not.exist")
+  })
+})