Don't fail on empty SEL list

If SEL list is empty, "GetSubTreePaths" method call to the
"xyz.openbmc_project.ObjectMapper" interface produces exception
"xyz.openbmc_project.Common.Error.ResourceNotFound".
As it is fine for the SEL log to be empty, this exception needs
special handling in the code.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: If7ecfee7c404aff079dadaaec27401c9c17daa6f
diff --git a/selutility.cpp b/selutility.cpp
index 11b2fb9..e02027f 100644
--- a/selutility.cpp
+++ b/selutility.cpp
@@ -407,26 +407,30 @@
     mapperCall.append(depth);
     mapperCall.append(ObjectPaths({logEntryIntf}));
 
-    auto reply = bus.call(mapperCall);
-    if (reply.is_method_error())
+    try
     {
-        log<level::INFO>("Error in reading logging entry object paths");
-    }
-    else
-    {
+        auto reply = bus.call(mapperCall);
         reply.read(paths);
-
-        std::sort(paths.begin(), paths.end(),
-                  [](const std::string& a, const std::string& b) {
-                      namespace fs = std::filesystem;
-                      fs::path pathA(a);
-                      fs::path pathB(b);
-                      auto idA = std::stoul(pathA.filename().string());
-                      auto idB = std::stoul(pathB.filename().string());
-
-                      return idA < idB;
-                  });
     }
+    catch (const sdbusplus::exception::exception& e)
+    {
+        if (strcmp(e.name(),
+                   "xyz.openbmc_project.Common.Error.ResourceNotFound"))
+        {
+            throw;
+        }
+    }
+
+    std::sort(paths.begin(), paths.end(),
+              [](const std::string& a, const std::string& b) {
+                  namespace fs = std::filesystem;
+                  fs::path pathA(a);
+                  fs::path pathB(b);
+                  auto idA = std::stoul(pathA.filename().string());
+                  auto idB = std::stoul(pathB.filename().string());
+
+                  return idA < idB;
+              });
 }
 
 } // namespace sel