From cb85eeb23fd6ccb0971c46ddaf3fd62d2a5f539b Mon Sep 17 00:00:00 2001
From: mmalerba <mmalerba@google.com>
Date: Mon, 27 Mar 2017 16:38:31 -0700
Subject: [PATCH] fix(input): fix blank aria-describedBy (#3713)

---
 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 06730719dac..3b5e5549440 100644
--- a/src/lib/input/input-container.ts
+++ b/src/lib/input/input-container.ts
@@ -101,7 +101,7 @@ export class MdErrorDirective { }
     '[placeholder]': 'placeholder',
     '[disabled]': 'disabled',
     '[required]': 'required',
-    '[attr.aria-describedby]': 'ariaDescribedby',
+    '[attr.aria-describedby]': 'ariaDescribedby || null',
     '(blur)': '_onBlur()',
     '(focus)': '_onFocus()',
     '(input)': '_onInput()',