Refactor query handlers to remove NotFoundException

Refactored query handlers (`ReadProfileViewQueryHandler`,
`ReadRecActionViewQueryHandler`, and `ReadResultViewQueryHandler`)
to return empty results instead of throwing `NotFoundException`
when no data is found. Simplified the logic by removing null
or empty result checks and directly returning mapped results.

Updated corresponding test cases to align with the new behavior:
- Removed `try-catch` blocks for `NotFoundException`.
- Adjusted assertions to handle empty results.
- Removed the test case for `ReadRecActionViewQuery` that
  expected `NotFoundException`.

This change reflects a design shift to let the calling code
handle empty results instead of relying on exceptions.

tests/ReC.Tests/Application/Profile/ProfileQueryTests.cs

@@ -30,23 +30,18 @@ public class ProfileQueryTests : RecApplicationTestBase
         var (sender, scope) = CreateScopedSender();
         using var _ = scope;
 
-        try
+        var profiles = await sender.Send(new ReadProfileViewQuery
         {
-            var profiles = await sender.Send(new ReadProfileViewQuery
-            {
-                Id = profileId,
-                IncludeActions = false
-            });
+            Id = profileId,
+            IncludeActions = false
+        });
 
-            var profile = profiles.Single();
-
-            Assert.That(profile.Id, Is.EqualTo(profileId));
-            Assert.That(profile.ProfileName, Is.Not.Null.And.Not.Empty);
-            Assert.That(profile.Active, Is.True);
-        }
-        catch (NotFoundException)
+        var profile = profiles.SingleOrDefault();
+        Assert.Multiple(() =>
         {
-            Assert.Pass("NotFound is acceptable when profile does not exist");
-        }
+            Assert.That(profile?.Id, Is.EqualTo(profileId));
+            Assert.That(profile?.ProfileName, Is.Not.Null.And.Not.Empty);
+            Assert.That(profile?.Active, Is.True);
+        });
     }
 }