Print msg for no arrival (avg)

Signed-off-by: HeshamTB <hishaminv@gmail.com>

src/MakkahCity.java

@@ -532,6 +532,7 @@ public class MakkahCity {
 		sum = sum /counter;
 		int hours = sum / 60;
 		int minutes = sum % 60;
+		if (hours == 0 && minutes == 0) return "(No arrivals) in last Hour";
 		return String.format("%2d:%02d", hours,minutes);
 	}