[DiagnosticLogs] When the size of the logs for the target intent is 0…

…, the server returns Exhausted instead of NoLogs (project-chip#32205)

src/app/clusters/diagnostic-logs-server/diagnostic-logs-server.cpp

@@ -115,6 +115,9 @@ void DiagnosticLogsServer::HandleLogRequestForResponsePayload(CommandHandler * c
     Optional<uint64_t> timeStamp;
     Optional<uint64_t> timeSinceBoot;
 
+    auto size = delegate->GetSizeForIntent(intent);
+    VerifyOrReturn(size != 0, AddResponse(commandObj, path, StatusEnum::kNoLogs));
+
     auto err = delegate->GetLogForIntent(intent, logContent, timeStamp, timeSinceBoot);
     VerifyOrReturn(CHIP_ERROR_NOT_FOUND != err, AddResponse(commandObj, path, StatusEnum::kNoLogs));
     VerifyOrReturn(CHIP_NO_ERROR == err, AddResponse(commandObj, path, StatusEnum::kDenied));
@@ -136,10 +139,13 @@ void DiagnosticLogsServer::HandleLogRequestForBdx(CommandHandler * commandObj, c
     auto * delegate = GetDiagnosticLogsProviderDelegate(path.mEndpointId);
     VerifyOrReturn(nullptr != delegate, AddResponse(commandObj, path, StatusEnum::kNoLogs));
 
+    auto size = delegate->GetSizeForIntent(intent);
+    // In the case where the size is 0 sets the Status field of the RetrieveLogsResponse to NoLogs and do not start a BDX session.
+    VerifyOrReturn(size != 0, HandleLogRequestForResponsePayload(commandObj, path, intent, StatusEnum::kNoLogs));
+
     // In the case where the Node is able to fit the entirety of the requested logs within the LogContent field, the Status field of
     // the RetrieveLogsResponse SHALL be set to Exhausted and a BDX session SHALL NOT be initiated.
-    VerifyOrReturn(delegate->GetSizeForIntent(intent) > kMaxLogContentSize,
-                   HandleLogRequestForResponsePayload(commandObj, path, intent, StatusEnum::kExhausted));
+    VerifyOrReturn(size > kMaxLogContentSize, HandleLogRequestForResponsePayload(commandObj, path, intent, StatusEnum::kExhausted));
 
     // If the RequestedProtocol is set to BDX and either the Node does not support BDX or it is not possible for the Node
     // to establish a BDX session, then the Node SHALL utilize the LogContent field of the RetrieveLogsResponse command