added testcases for address#parse function,changed empty to null (conforms to existing code)

        } catch (MimeException pe) {

            Log.e(K9.LOG_TAG, "MimeException in Address.parse()", pe);

            //but we do an silent failover : we just use the given string as name with empty address

            addresses.add(new Address("", addressList));

            addresses.add(new Address(null, addressList,false));

        }

        return addresses.toArray(EMPTY_ADDRESS_ARRAY);

    }

package com.fsck.k9.helper;

import junit.framework.TestCase;

public class Address extends TestCase {

    /**

     * test the possibility to parse "From:" fields with no email.

     * for example: From: News for Vector Limited - Google Finance

     * http://code.google.com/p/k9mail/issues/detail?id=3814

     */

    public void testParseWithMissingEmail() {

        com.fsck.k9.mail.Address[] addresses =  com.fsck.k9.mail.Address.parse("NAME ONLY");

        assertEquals(1, addresses.length);

        assertEquals(null, addresses[0].getAddress());

        assertEquals("NAME ONLY", addresses[0].getPersonal());

    }

    /**

     * test name + valid email

     */

    public void testPraseWithValidEmail() {

        com.fsck.k9.mail.Address[] addresses =  com.fsck.k9.mail.Address.parse("Max Mustermann <maxmuster@mann.com>");

        assertEquals(1, addresses.length);

        assertEquals("maxmuster@mann.com", addresses[0].getAddress());

        assertEquals("Max Mustermann", addresses[0].getPersonal());

    }

    /**

     * test with multi email addresses

     */

    public void testPraseWithValidEmailMulti() {

        com.fsck.k9.mail.Address[] addresses =  com.fsck.k9.mail.Address.parse("lorem@ipsum.us,mark@twain.com");

        assertEquals(2, addresses.length);

        assertEquals("lorem@ipsum.us", addresses[0].getAddress());

        assertEquals(null, addresses[0].getPersonal());

        assertEquals("mark@twain.com", addresses[1].getAddress());

        assertEquals(null, addresses[1].getPersonal());

    }

}