test invalid address

lib/address.js

@@ -11,7 +11,11 @@ function Address(obj) {
 };
 
 Address.isValid = function(addrstr) {
-  var address = new Address().fromString(addrstr);
+  try {
+    var address = new Address().fromString(addrstr);
+  } catch (e) {
+    return false;
+  }
   return address.isValid();
 };
 

test/test.address.js

@@ -18,6 +18,10 @@ describe('Address', function() {
       Address.isValid(str).should.equal(true);
     });
 
+    it('should invalidate this valid address string', function() {
+      Address.isValid(str.substr(1)).should.equal(false);
+    });
+
   });
 
   describe('#fromPubkey', function() {