Fix issue 924 - splitting the empty string.

src/string.js

Index: src/string.js
diff --git a/src/string.js b/src/string.js
index a75ccf0fa54f0747223e7be60845cfbd6af95d95..1f2255aa196dd99d7d09dd913cf2c2a001db3ac4 100644
--- a/src/string.js
+++ b/src/string.js
@@ -567,7 +567,7 @@ function StringSplit(separator, limit) {
   %_Log('regexp', 'regexp-split,%0S,%1r', [subject, separator]);
 
   if (length === 0) {
-    if (splitMatch(separator, subject, 0, 0) != null) {
+    if (DoRegExpExec(separator, subject, 0, 0) != null) {
       return [];
     }
     return [subject];