Fix issue with querying yesterday's stats without a data file

cv

@@ -41,6 +41,8 @@ result(){
 	echo "Active: $(get active)"
 	echo "New:    $(get todayCases)"
 	echo "Tests:  $(get tests)"
+	if [ -f $data/$ydate-$country ]
+	then
 		show "Yesterday's stats:"
 		echo "New:    $(yget todayCases)"
 		if [ $(get todayCases) == "0" ]
@@ -59,6 +61,9 @@ result(){
 				ex "rm $data/$date-$country"
 			fi
 		fi
+	else
+		show "Yesterday's data file for this country doesn't exist."
+	fi
 }
 
 show "Queried at: $date"