[birt-dev] CheckIn: Remove the invalid node of history bar in chart buil

["Yulin Wang" <yulin.wang@xxxxxxxxxxx>]

- Summary:
Remove the invalid node of history bar in chart builder

- Bugzilla Bug (s) Resolved:

- Description:
Currently, invalid node in history bar is labled as "#Invalid" . For better usability, to make the invalid node invisible.

- Tests Description: Manual Test

- Notes to Build Team: N/A

- Notes to Developers: N/A

- Notes to QA: N/A

- Notes to Documentation: N/A

- Files Edited:
/org.eclipse.birt.core.ui/src/org/eclipse/birt/core/ui/frameworks/taskwizard/internal/SubtaskHistory.java

- Files Added:

- Files Deleted