[birt-dev] Checkin: fix 135484 NPE will throw out when adding a data bin

["Yuejie Chen" <yuejie.chen@xxxxxxxxxxx>]

- Summary: fix 135484 NPE will throw out when adding a data binding column, add NLS, implements method getNewBindingName().

- Bugzilla Bug (s) Resolved:
135484
- Description:
1. Fix 135484 NPE will throw out when adding a data binding column
2. Add NLS
3. Implements method getNewBindingName() in DataSetColumnBindingsProvider

- Tests Description:
Manual test

- Notes to Build Team:

- Notes to Developers:

- Notes to QA:

- Notes to Documentation:

- Files Edited:

/org.eclipse.birt.report.designer.core/src/org/eclipse/birt/report/designer/nls/messages.properties
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/attributes/page/DataSetColumnBindingsFormPage.java
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/views/attributes/provider/DataSetColumnBindingsFormHandleProvider.java

- Files Added:

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