fix contains no element error for empty skills

ProgramManager/src/Application/GozareshgirProgramManager.Application/Modules/Projects/Queries/ProjectDeployBoardDetail/ProjectDeployBoardDetailsQueryHandler.cs

@@ -73,6 +73,7 @@ public class
 
             var doneTime = t.Sections.Aggregate(TimeSpan.Zero,
                 (sum, next) => sum.Add(next.GetTotalTimeSpent()));
+            
             var skills = t.Sections
                 .Select(s =>
                 {
@@ -88,7 +89,14 @@ public class
                         skillName,
                         timePercentage);
                 }).ToList();
-            var taskPercentage = (int)Math.Round(skills.Average(x => x.TimePercentage));
+            
+            int taskPercentage = 0;
+            
+            if (!skills.Any())
+            {
+                taskPercentage = 0;
+            }
+            taskPercentage = (int)Math.Round(skills.Average(x => x.TimePercentage));
 
             return new ProjectDeployBoardDetailTaskItem(
                 t.Name,