[spidermonkey] check for empty string

src/ecmascript/spidermonkey/urlsearchparams.cpp

@@ -103,6 +103,10 @@ JSClass urlSearchParams_class = {
 static void
 parse_text(JSContext *ctx, JS::HandleObject obj, char *str)
 {
+	if (!str || !*str) {
+		return;
+	}
+
 	char *kvpairs[1024];
 	int i = qs_parse(str, kvpairs, 1024);
 	int j;

test/ecmascript/assert/URLSearchParams.html

@@ -1,6 +1,9 @@
 <script>
 console.error("URLSearchParams.html");
 
+var empty = new URLSearchParams('');
+console.assert(empty.size === 0, 'empty');
+
 var param = new URLSearchParams('?foo=1&bar=2&cc=3');
 console.assert(param.size === 3, 'size is 3');
 console.assert(param.has('foo'), 'foo');