8031435: Ftp download does not work properly for ftp user without password

Reviewed-by: chegar

src/share/classes/sun/net/www/protocol/ftp/FtpURLConnection.java

@@ -301,7 +301,7 @@ public class FtpURLConnection extends URLConnection {
             throw new IOException(fe);
         }
         try {
-            ftp.login(user, password.toCharArray());
+            ftp.login(user, password == null ? null : password.toCharArray());
         } catch (sun.net.ftp.FtpProtocolException e) {
             ftp.close();
             // Backward compatibility

test/sun/net/ftp/FtpURL.java

@@ -483,7 +483,7 @@ public class FtpURL {
 
             // Now let's check the URL handler
 
-            url = new URL("ftp://user2:@localhost:" + port + "/%2Fusr/bin;type=d");
+            url = new URL("ftp://user2@localhost:" + port + "/%2Fusr/bin;type=d");
             con = url.openConnection();
             in = new BufferedReader(new InputStreamReader(con.getInputStream()));
             do {