Throw additional error on fetch connection to card reader

public/js/mykad-reader.js

@@ -6,12 +6,16 @@ let removeCRLFfromString = (response_text) => {
     return response_text.replace(/[\n\r]+/g, '').replace(/\s{2,10}/g, ' ');
 };
 
+const myKad_reader_error = new Error('Sila sambungkan pembaca MyKad dengan betul');
 
 let getMyKadDetail = () => {
     return fetch(mykad_reader_endpoint)
         .then(response => response.text())
         .then(response => removeCRLFfromString(response))
         .then(response => JSON.parse(response))
+        .catch(error => {
+            throw myKad_reader_error;
+        });
 };
 
 let checkIfMyKadExist = (myKadNumber) => {
@@ -29,7 +33,7 @@ let handleMyKadReader = () => {
         .then(response => myKadDetail = response[0])
         .then(() => {
             if (myKadDetail.ReadStatus === 'ERROR') {
-                throw new Error('Sila sambungkan pembaca MyKad dengan betul');
+                throw myKad_reader_error;
             }
         })
         .then(() => checkIfMyKadExist(myKadDetail.IdNo))