iv - crashes trying to open non-image file

[sambler]

starting iv from a terminal with a command such as

iv /home/shane/images/*

where images contains image files as well as another dir and a text file, then cycle through images with PgUp/PgDwn causes iv to crash when a non-image file is the next item in the list. Similarly if just the dir is sent without the trailing /* then it crashes trying to open it.