[birt-dev] CheckIN:Fix bugzilla bug 137178 Reopen the edit of the datase

["Mingxia Wu" <mwu@xxxxxxxxxxx>]

Title: CheckIN:Fix bugzilla bug 137178 Reopen the edit of the dataset, the query tab is disappear when the qurey is completely blank

- Summary:
Fix bugzilla bug 137178

- Bugzilla Bug (s) Resolved:
Bugzilla bug 137178 Reopen the edit of the dataset, the query tab is disappear when the qurey is completely blank

- Description:
If the user leaves query text blank, the query text should be taken on as “” string not null value, because null value is not valid for ODA designer validation

- Tests Description:
UI Feature

- Files Added:

- Files Edited:
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/data/ui/dataset/DTPUtil.java

- Files Deleted:

- Notes to Build Team:
N/A

- Notes to Developers:
N/A

- Notes to QA:  
N/A

- Notes to Documentation:  
N/A