[birt-dev] Bugzilla Bug 147625 [Regression]A library without defaultThem

["Qiangsheng Wang" <qwang@xxxxxxxxxxx>]

Summary 
Bugzilla Bug 147625 [Regression]A library without defaultTheme

Bugzilla Bug (s) Resolved:  147625

Description:
For model allow the default theme be deleted, the Libraryhandle:getTheme can return null. Need check this case when try to get available styles of library.

Test Description:
Manual Test
 
Files Edited:  "/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/util/DEUtil.java"

Notes to Build Team:
 
Notes to Developers:

Notes to QA:
 
Quotes to Documentation: 
WangQS