In the statistic menu, you see table data for your Last Imported Campaign as well as for All Campaigns. In some of the columns, you will see sometimes a dash or hyphen instead of a number.
The CPC column shows a dash if there are no clicks because there is no cost if there are no clicks! The same is true for the CTR or Click Through Ratio. No clicks here means that the program can’t calculate it and shows a dash.
A third metrics is the ACoS, which can’t show you anything if there are no sales. We could show are zero here, but decided that a dash separates it better from a number.