When no line exists, Percent should return default percentage value 100.

Author: sasivishnu

src/coverlet.core/CoverageDetails.cs

@@ -6,6 +6,6 @@ public class CoverageDetails
     {
         public double Covered { get; internal set; }
         public int Total { get; internal set; }
-        public double Percent => Total == 0 ? 1D : Math.Floor((Covered / Total) * 10000) / 100;
+        public double Percent => Total == 0 ? 100D : Math.Floor((Covered / Total) * 10000) / 100;
     }
 }