Updating test case to cover this scenario properly.

packages/server/src/integrations/tests/rest.spec.ts

@@ -245,13 +245,13 @@ describe("REST Integration", () => {
       expect(output.extra.headers["content-type"]).toEqual("application/xml")
     })
 
-    test.each(contentTypes)(
+    test.each([...contentTypes, undefined])(
       "should not throw an error on 204 no content",
       async contentType => {
         const input = buildInput(undefined, null, contentType, 204)
         const output = await config.integration.parseResponse(input)
         expect(output.data).toEqual([])
-        expect(output.extra.raw).toEqual([])
+        expect(output.extra.raw).toEqual("")
         expect(output.info.code).toEqual(204)
         expect(output.extra.headers["content-type"]).toEqual(contentType)
       }