make getVariable return blank string not the word false

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@9328 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/languages/mod_spidermonkey/mod_spidermonkey.c

@@ -1811,7 +1811,7 @@ static JSBool session_get_variable(JSContext * cx, JSObject * obj, uintN argc, j
 		if (val) {
 			*rval = STRING_TO_JSVAL(JS_NewStringCopyZ(cx, val));
 		} else {
-			*rval = BOOLEAN_TO_JSVAL(JS_FALSE);
+			*rval = STRING_TO_JSVAL(JS_NewStringCopyZ(cx, ""));
 		}
 	} else {
 		*rval = BOOLEAN_TO_JSVAL(JS_FALSE);