My Input file Sales tab has no data and I got error on below workflow if the sheet is blank. Please do the needful.
What version of Alteryx are you on? If you're on the latest, control containers should solve for this. Otherwise perhaps a detour tool paired with a count rows tool could help add logic to not process the data if the tab is empty.
You got an error because there's no data in your input (Example file.xlsx|||Sales). What are you trying to accomplish?