From 6c5d904e3400b935c0fd17fdbe9254cb44dda092 Mon Sep 17 00:00:00 2001
From: Miles Malerba <mmalerba@google.com>
Date: Tue, 21 Mar 2017 14:14:47 -0700
Subject: [PATCH] fix(input): fix blank aria-describedBy

---
 src/lib/input/input-container.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/input/input-container.ts b/src/lib/input/input-container.ts
index bbc7c0a15b91..e0e43117ad67 100644
--- a/src/lib/input/input-container.ts
+++ b/src/lib/input/input-container.ts
@@ -83,7 +83,7 @@ export class MdHint {
     '[placeholder]': 'placeholder',
     '[disabled]': 'disabled',
     '[required]': 'required',
-    '[attr.aria-describedby]': 'ariaDescribedby',
+    '[attr.aria-describedby]': 'ariaDescribedby || null',
     '(blur)': '_onBlur()',
     '(focus)': '_onFocus()',
     '(input)': '_onInput()',