Import fails if delimeter not set

Hi

In Firefox 30 if you don’t select the default delimeter manually the import will fail as on line 325 in WPImporter_includes_helper.php $this->delim will be null.

I fixed this by adding ($this->delim ? $this->delim : ‘,’), however the correct fix would be to add selected to the select option tag on the options page.

This was working for me, however I’m guessing something has changed in my browser from posting the currently selected option to not posting if you don’t select.

https://wordpress.org/plugins/wp-ultimate-csv-importer/