Fixed eslint errors

app/assets/javascripts/boards/components/modal/filters/label.js.es6

+/* eslint-disable no-new */
 /* global Vue */
-/* global LabelSelect */
+/* global LabelsSelect */
 (() => {
   gl.issueBoards.ModalLabelFilter = Vue.extend({
     props: {

app/assets/javascripts/boards/components/modal/filters/milestone.js.es6

+/* eslint-disable no-new */
 /* global Vue */
 /* global MilestoneSelect */
 (() => {

app/assets/javascripts/boards/components/modal/filters/user.js.es6

+/* eslint-disable no-new */
 /* global Vue */
 /* global UsersSelect */
 (() => {

app/assets/javascripts/boards/components/modal/index.js.es6

@@ -67,22 +67,22 @@
           this.loadIssues(true);
         },
         deep: true,
-      }
+      },
     },
     methods: {
       searchOperation: _.debounce(function searchOperationDebounce() {
         this.loadIssues(true);
       }, 500),
       loadIssues(clearIssues = false) {
-        if (!this.showAddIssuesModal) return;
-        const data = Object.assign({}, this.filter, {
+        if (!this.showAddIssuesModal) return false;
+        const queryData = Object.assign({}, this.filter, {
           search: this.searchTerm,
           page: this.page,
           per: this.perPage,
         });
-        return gl.boardService.getBacklog(data).then((res) => {
+        return gl.boardService.getBacklog(queryData).then((res) => {
           const data = res.json();
           if (clearIssues) {

app/assets/javascripts/milestone_select.js

@@ -6,7 +6,7 @@
 (function() {
   this.MilestoneSelect = (function() {
     function MilestoneSelect(currentProject, els) {
-      var _this;
+      var _this, $els;
       if (currentProject != null) {
         _this = this;
         this.currentProject = JSON.parse(currentProject);
@@ -18,7 +18,7 @@
         $els = $('.js-label-select');
       }
-      $('.js-milestone-select').each(function(i, dropdown) {
+      $els.each(function(i, dropdown) {
         var $block, $dropdown, $loading, $selectbox, $sidebarCollapsedValue, $value, abilityName, collapsedSidebarLabelTemplate, defaultLabel, issuableId, issueUpdateURL, milestoneLinkNoneTemplate, milestoneLinkTemplate, milestonesUrl, projectId, selectedMilestone, showAny, showNo, showUpcoming, useId, showMenuAbove;
         $dropdown = $(dropdown);
         projectId = $dropdown.data('project-id');

app/assets/stylesheets/pages/boards.scss

@@ -392,7 +392,8 @@
     &.add-issues-empty-state-filter {
       -webkit-flex-direction: column;
       flex-direction: column;
-      margin-top: 50px;
+      -webkit-justify-content: center;
+      justify-content: center;
     }
     > .row {