[birt-dev] Checkin: Fix bugzilla 118182 -- NPE is thrown out when export

["Chenzhong Yu" <cyu@xxxxxxxxxxx>]

Title: Checkin: Fix bugzilla 118182 -- NPE is thrown out when exporting a design which include an extension element.

- Summary:
- Bugzilla Bug (s) Resolved: 118182
- Description:
  Bugzilla 118182:
        NPE is thrown out when exporting a design which include an extension element. Fixed.
  newElement(String,String) doesn't properly create the extension element, so a Chart item in the
  report design is not duplicated which leads to the NPE.

  Fix a bug in ElementFactory, allowing newElement(String,String) create an extension element.

- Tests Description  :  Unit Tests

- Files Edited:
  /home/birt/source/org.eclipse.birt.report.model/test/org/eclipse/birt/report/model/extension/ReportItemExtensionTest.java

  /home/birt/source/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ElementFactory.java

- Files Added:

- Notes to Build Team:

- Notes to Developers:

- Notes to QA: 
 
- Notes to Documentation: 

Thanks,
Rock Yu

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