miffo1 on "[Plugin: Picasa Express x2] showing filename if there is no caption"

i guess this will need more system hack, but how can i turn off showing title under the images, when they don't have caption. I want the caption showing only on files which have actuall caption added by me, but the rest i don't want to see filename like "DSC00945.JPG" that looks weird. Only way is to name them with "." but that looks weird as well.
Thank you for hints!

http://wordpress.org/extend/plugins/picasa-express-x2/