[birt-dev] Checkin: fix 135483 drag a dataset column to layout throws ex

["Yuejie Chen" <yuejie.chen@xxxxxxxxxxx>]

- Summary: fix 135483
drag a dataset column to layout throws exceptions in Error Log

- Bugzilla Bug (s) Resolved:
135483
- Description:
Data Binding Column is already added, Data set is not set, fix now.

- Tests Description:
Manual test.
- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:

/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dnd/InsertInLayoutUtil.java
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/editors/schematic/tools/ReportCreationTool.java

- Files Added:

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