FtpWagon class needs to handle possible null returned from 
ftpFiles[0].getTimestamp()
-------------------------------------------------------------------------------------

                 Key: WAGON-242
                 URL: http://jira.codehaus.org/browse/WAGON-242
             Project: Maven Wagon
          Issue Type: Bug
          Components: wagon-ftp
    Affects Versions: 1.0-beta-4
         Environment: IBM z/OS Unix System Services
            Reporter: D.R.
            Priority: Blocker


The following line can return a null value, causing a null pointer exception in 
the code.

FtpWagon.fillInputData()
...
 //@todo check how it works! javadoc of common login says:
 // Returns the file timestamp. This usually the last modification time.
//
long lastModified = ftpFiles[0].getTimestamp().getTimeInMillis();
...

org.apache.commons.net.ftp.parser.UnixFTPEntryParser.parseFTPEntry()
...
try
{
  file.setTimestamp(super.parseTimestamp(datestr));
}
catch (ParseException e)
 {
    return null;  // this is a parsing failure too.
}
...

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