feat(js): abort request and show message if any field is empty

src/static/webldappasswd.js

@@ -25,6 +25,11 @@ MODAL_STATES = {
     message : "Password changed",
     icon_url : "checkmark.svg",
   },
+  "FillAllFields" : {
+    button_disabled : false,
+    message : "You have to fill all three input fields",
+    icon_url : "cross.svg",
+  },
   "FetchError" : {
     button_disabled : false,
     message : "An error occurred while contacting the server",
@@ -82,6 +87,11 @@ function clearFields() {
 function changePasswords() {
   const query = {};
 
+  if(!fields().every(field.value.length != 0)) {
+    showModal("FillAllFields");
+    return;
+  }
+
   fields().forEach(field => {
     query[field.name] = field.value;
   });