JS parser: remove empty tokens after lexing. This fixes a problem where a string with leading space couldn't be parsed.

lib/javascript/gflib.js

@@ -410,6 +410,10 @@ Parser.prototype.showRules = function () {
 };
 Parser.prototype.parseString = function (string, cat) {
 	var tokens = string.split(" ");
+	// remove empty tokens
+	for (var i = tokens.length - 1; i >= 0; i--) {
+		if (tokens[i] == "") { tokens.splice(i, 1); }
+	}
 	chart = new Chart(true);
 	predict(this.rules, tokens);
 	while (chart.updated) {