Improve support for binding pattern

Including improvements for parameters, variable assignment and
catch parameter.

test/mocha/try.js

@@ -0,0 +1,22 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Try", function() {
+    it("Should not allow catch with an empty parameter", function() {
+        var tests = [
+            "try {} catch() {}"
+        ];
+
+        var test = function(code) {
+            return function () {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function (e) {
+            return e instanceof uglify.JS_Parse_Error;
+        }
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error, tests[i]);
+        }
+    });
+});