fix(admin-next, utils, medusa): Handle db errors properly and fix form (#7416)

* fix(admin-next, utils, medusa): Handle db errors properly and fix form

* fix(admin-next, utils, medusa): Handle db errors properly and fix form

* fix(admin-next, utils, medusa): Handle db errors properly and fix form

* fix(admin-next, utils, medusa): Handle db errors properly and fix form

packages/core/js-sdk/src/client.ts

@@ -45,8 +45,12 @@ const normalizeRequest = (
 
 const normalizeResponse = async (resp: Response, reqHeaders: Headers) => {
   if (resp.status >= 300) {
-    const error = new FetchError(resp.statusText, resp.status)
-    throw error
+    const jsonError = await resp.json().catch(() => ({})) as { message?: string }
+    throw new FetchError(
+      jsonError.message ?? resp.statusText,
+      resp.statusText,
+      resp.status
+    )
   }
 
   // If we requested JSON, we try to parse the response. Otherwise, we return the raw response.
@@ -56,9 +60,11 @@ const normalizeResponse = async (resp: Response, reqHeaders: Headers) => {
 
 export class FetchError extends Error {
   status: number | undefined
+  statusText: string | undefined
 
-  constructor(message: string, status?: number) {
+  constructor(message: string, statusText?: string, status?: number) {
     super(message)
+    this.statusText = statusText
     this.status = status
   }
 }