fix: actual npe fix

Author: BFergerson

services/src/main/kotlin/spp/probe/services/common/ContextReceiver.kt

@@ -162,7 +162,7 @@ object ContextReceiver {
             .setTimestamp(System.currentTimeMillis())
             .setService(Config.Agent.SERVICE_NAME)
             .setServiceInstance(Config.Agent.INSTANCE_NAME)
-            .apply { endpoint = ContextManager.getPrimaryEndpointName() }
+            .apply { ContextManager.getPrimaryEndpointName()?.let { endpoint = it } }
             .setTags(logTags.build())
             .setBody(
                 LogDataBody.newBuilder().setType(LogDataBody.ContentCase.TEXT.name)