Fix announcer say method for message undefined or null.

Closure Team · kjin · commit 3b9a16d85741 · 2020-02-26T19:27:10.000Z
RELNOTES: n/a

PiperOrigin-RevId: 297207505
diff --git a/closure/goog/a11y/aria/announcer.js b/closure/goog/a11y/aria/announcer.js
@@ -88,7 +88,7 @@ goog.a11y.aria.Announcer.prototype.say = function(message, opt_priority) {
   const announceMessage = this.lastMessageAnnounced_ === message ?
       message + goog.string.Unicode.NBSP :
       message;
-  if (!goog.string.isEmptyString(message)) {
+  if (message) {
     this.lastMessageAnnounced_ = announceMessage;
   }
   goog.dom.setTextContent(liveRegion, announceMessage);

Original file line number	Diff line number	Diff line change
`@@ -88,7 +88,7 @@ goog.a11y.aria.Announcer.prototype.say = function(message, opt_priority) {`
`88`	`88`	`const announceMessage = this.lastMessageAnnounced_ === message ?`
`89`	`89`	`message + goog.string.Unicode.NBSP :`
`90`	`90`	`message;`
`91`		`- if (!goog.string.isEmptyString(message)) {`
	`91`	`+ if (message) {`
`92`	`92`	`this.lastMessageAnnounced_ = announceMessage;`
`93`	`93`	`}`
`94`	`94`	`goog.dom.setTextContent(liveRegion, announceMessage);`