decoded filename in IMAPBodyPart

Author: fred84

mail/src/main/java/com/sun/mail/imap/IMAPBodyPart.java

@@ -168,7 +168,7 @@ public String getFileName() throws MessagingException {
 	String filename = null;
 	if (bs.dParams != null)
 	    filename = bs.dParams.get("filename");
-	if (filename == null && bs.cParams != null)
+	if ((filename == null || filename.equals("")) && bs.cParams != null)
 	    filename = bs.cParams.get("name");
 	if (decodeFileName && filename != null) {
 	    try {