run the attachment empty-listbox-with-hidden-column.zul
compare the positions/sizes of the empty messages
depending on which columns are invisible the size and position varies between different listboxes, if the first column is invisible the message even line breaks
empty message cell should span over all columns to have the whole table width available for an "empty-message"
the colspan attribute is calculated incorrectly - ignoring invisible columns
currently commented out in empty-listbox-with-hidden-column.zul