Improved legibility of REST Mock interface and various fixes (#266)

Reviewed-on: #266
Reviewed-by: Mikolaj Widla <widlam@noreply.example.com>
Co-authored-by: Adam Bem <adam.bem@zoho.eu>
Co-committed-by: Adam Bem <adam.bem@zoho.eu>

Frontend/src/components/formatter/XMLButtonFormatterComponent.vue

@@ -5,7 +5,10 @@ const props = defineProps({
     isMinimizer: {type: Boolean}
 })
 
-const emit = defineEmits(["update:result"])
+const emit = defineEmits([
+    'update:result',
+    'update:error'
+])
 
 function process() {
     var request:Request = prepareRequest()
@@ -42,7 +45,10 @@ function prepareRequestBody():string {
 async function fetchRequest(request: Request):Promise<JSON> {
     var responseBody = await fetch(request)
     .then(response => response.json())
-    .then((body) => body)
+    .then((body) => {
+        emit("update:error", body.status == "ERR")
+        return body
+    })
     return responseBody
 }