[birt-dev]CheckIn: Fix Bugzilla Bug 138733 --- getExpressionValue fails

["Wei Zhao (Shang)" <wei.zhao@xxxxxxxxxxx>]

Title: [birt-dev]CheckIn: Fix Bugzilla Bug 138733 --- getExpressionValue fails

Summary 
Modify getRowData() to return the rowData as:
1. if the report item has query, return rowData of this query.
2. If the report item has no query, return the rowData of its parent.
3. If it is the toplevel element and has no query, return null.

Bugzilla Bug (s) Resolved:
Fix Bugzilla Bug 138733 --- getExpressionValue fails

Description:
Why:
Only return this rowData, else return null.

Fix:
Fixed.
 
Test Description:
Manual Test
 
Files Edited:
"/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/script/internal/instance/ReportElementInstance.java"

Files Added:

Notes to Build Team:
 
Notes to Developers:

Notes to QA:
 
Quotes to Documentation:

-Wei Zhao