Fix NPE in SystemData transform, correct NONE type display

[leehaut]

1. Fix NullPointerException when no parent workflow is present

2026/04/18 18:41:11 [Error]    Get system info.0 - Unexpected error
2026/04/18 18:41:11 [Error]    Get system info.0 - java.lang.NullPointerException: Cannot invoke "org.apache.hop.workflow.engine.IWorkflowEngine.getExecutionStartDate()" because the return value of "org.apache.hop.pipeline.engine.IPipelineEngine.getParentWorkflow()" is null
2026/04/18 18:41:11 [Error]    Get system info.0 - 	at org.apache.hop.pipeline.transforms.systemdata.SystemData.getSystemData(SystemData.java:88)
2026/04/18 18:41:11 [Error]    Get system info.0 - 	at org.apache.hop.pipeline.transforms.systemdata.SystemData.processRow(SystemData.java:739)
2026/04/18 18:41:11 [Error]    Get system info.0 - 	at org.apache.hop.pipeline.transform.RunThread.run(RunThread.java:54)
2026/04/18 18:41:11 [Error]    Get system info.0 - 	at java.base/java.lang.Thread.run(Thread.java:1583) 

2. Fix incorrect display for NONE type

3. Improvement sonar