Define data with json converted response body

Author: keiko713

src/addons.js

@@ -59,6 +59,7 @@ async function deleteAddon(settings, netlifyApiToken) {
   })
 
   if (response.status === 422) {
+    const data = await response.json()
     throw new Error(`Error ${JSON.stringify(data)}`)
   }
 
@@ -81,6 +82,8 @@ async function updateAddon(settings, netlifyApiToken) {
     }),
   })
 
+  const data = await response.json()
+
   if (response.status === 422) {
     throw new Error(`Error ${JSON.stringify(data)}`)
   }