[birt-dev] Checkin: Fix possible NPE of the control for defining paramet

["Hongchang Lin" <hlin@xxxxxxxxxxx>]

SummaryFix possible NPE of the control for defining parameter default value

Bugzilla Bug (s) Resolved None

Description
Fix the possible NPE when manipulate the default value combo chooser on parameter dialog.

Tests Description Manual test and code review

Notes to Build Team

Notes to Developers

Notes to QA

Notes to Documentation

Files Edited

/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/CascadingParametersDialog.java
/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java

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Hongchang Lin