[birt-dev] CheckIn:Fix bugzilla bug 159014 createDataExtractionTask Caus

["Mingxia Wu" <mwu@xxxxxxxxxxx>]

Title: CheckIn:Fix bugzilla bug 159014 createDataExtractionTask Causing NullPointerException

- Summary:
Fix bugzilla bug 159014

- Bugzilla Bug (s) Resolved:
Bug 159014 createDataExtractionTask Causing NullPointerException

- Description:
If user does not put the report parameter value used in property binding in his application, we may get this report parameter's value is Null when we evaluate property binding _expression_, which might cause NPE. Now I’ve fixed this NPE

- Tests Description:
Manual test

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:  

- Notes to Documentation:  

- Files Edited:
/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java

- Files Added:

- Files Deleted