#2248 - All tests (bar the one config file test) now working. Still need to tidy up docstrings and some docs. Almost there

src/primaite/simulator/system/services/ntp/ntp_client.py

@@ -108,13 +108,14 @@ class NTPClient(Service):
 
     def request_time(self) -> None:
         """Send request to ntp_server."""
-        self.software_manager.session_manager.receive_payload_from_software_manager(
-            payload=NTPPacket(),
-            dst_ip_address=self.ntp_server,
-            src_port=self.port,
-            dst_port=self.port,
-            ip_protocol=self.protocol,
-        )
+        if self.ntp_server:
+            self.software_manager.session_manager.receive_payload_from_software_manager(
+                payload=NTPPacket(),
+                dst_ip_address=self.ntp_server,
+                src_port=self.port,
+                dst_port=self.port,
+                ip_protocol=self.protocol,
+            )
 
     def apply_timestep(self, timestep: int) -> None:
         """