Fixes issue #1948; implements String.isEmpty()

Review by: jat
Suggested by: jat


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@2474 8db76d5a-ed1c-0410-87a9-c151d255dfc7

user/super/com/google/gwt/emul/java/lang/String.java

diff --git a/user/super/com/google/gwt/emul/java/lang/String.java b/user/super/com/google/gwt/emul/java/lang/String.java
index 9f5d2c7..637c2ee 100644
--- a/user/super/com/google/gwt/emul/java/lang/String.java
+++ b/user/super/com/google/gwt/emul/java/lang/String.java
@@ -489,6 +489,10 @@
     return String(this);
   }-*/;
 
+  public native boolean isEmpty() /*-{
+    return !this.length;
+  }-*/;
+
   public int lastIndexOf(int codePoint) {
     return lastIndexOf(fromCodePoint(codePoint));
   }