None of these suggestions worked for me and its all quite fiddly! Actually the easiest way to do it if you have a chart with (blank) is to click on the filter. Somebody said that unchecking the blank box is annoying because when you add new data you have
to go in and check the box - correct! However in filter, go to:
Label Filters
Does not equal...
type in the box (blank)
this will remove the blank, and will allow other data to be added without having to play with the filters. NB: make sure the All box is clicked to make sure it will automatically update.
As a general rule, if you are playing around to look at figures one off, use the tick boxes, if you want to only show a couple, or remove a couple from future reporting, use the "filter by label"
Hope this helps!