stub error handlers where uncaught Promise rejections currently exist

app/assets/javascripts/boards/components/board.js

@@ -35,7 +35,10 @@ gl.issueBoards.Board = Vue.extend({
     filter: {
       handler() {
         this.list.page = 1;
-        this.list.getIssues(true);
+        this.list.getIssues(true)
+          .catch(() => {
+            // TODO: handle request error
+          });
       },
       deep: true,
     },

app/assets/javascripts/boards/components/board_blank_state.js

@@ -70,7 +70,10 @@ export default {
 
             list.id = listObj.id;
             list.label.id = listObj.label.id;
-            list.getIssues();
+            list.getIssues()
+              .catch(() => {
+                // TODO: handle request error
+              });
           });
         })
         .catch(() => {

app/assets/javascripts/boards/components/board_list.js

@@ -90,7 +90,10 @@ export default {
         if (this.scrollHeight() <= this.listHeight() &&
           this.list.issuesSize > this.list.issues.length) {
           this.list.page += 1;
-          this.list.getIssues(false);
+          this.list.getIssues(false)
+            .catch(() => {
+              // TODO: handle request error
+            });
         }
 
         if (this.scrollHeight() > Math.ceil(this.listHeight())) {

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

@@ -108,6 +108,8 @@ gl.issueBoards.IssuesModal = Vue.extend({
         if (!this.issuesCount) {
           this.issuesCount = data.size;
         }
+      }).catch(() => {
+        // TODO: handle request error
       });
     },
   },

app/assets/javascripts/boards/models/list.js

@@ -25,7 +25,9 @@ class List {
     }
 
     if (this.type !== 'blank' && this.id) {
-      this.getIssues();
+      this.getIssues().catch(() => {
+        // TODO: handle request error
+      });
     }
   }
 
@@ -52,11 +54,17 @@ class List {
     gl.issueBoards.BoardsStore.state.lists.splice(index, 1);
     gl.issueBoards.BoardsStore.updateNewListDropdown(this.id);
 
-    gl.boardService.destroyList(this.id);
+    gl.boardService.destroyList(this.id)
+      .catch(() => {
+        // TODO: handle request error
+      });
   }
 
   update () {
-    gl.boardService.updateList(this.id, this.position);
+    gl.boardService.updateList(this.id, this.position)
+      .catch(() => {
+        // TODO: handle request error
+      });
   }
 
   nextPage () {
@@ -146,11 +154,17 @@ class List {
     this.issues.splice(oldIndex, 1);
     this.issues.splice(newIndex, 0, issue);
 
-    gl.boardService.moveIssue(issue.id, null, null, moveBeforeIid, moveAfterIid);
+    gl.boardService.moveIssue(issue.id, null, null, moveBeforeIid, moveAfterIid)
+      .catch(() => {
+        // TODO: handle request error
+      });
   }
 
   updateIssueLabel(issue, listFrom, moveBeforeIid, moveAfterIid) {
-    gl.boardService.moveIssue(issue.id, listFrom.id, this.id, moveBeforeIid, moveAfterIid);
+    gl.boardService.moveIssue(issue.id, listFrom.id, this.id, moveBeforeIid, moveAfterIid)
+      .catch(() => {
+        // TODO: handle request error
+      });
   }
 
   findIssue (id) {