Bug 153412 Change parameter type will cause preview fail
Description: Change parameter type will cause preview fail Steps to reproduce: 1. New a report paramter, string, text-box, default value is abc. 2. Drag the parameter to Layout and preview. 3. Change the parameter's type to integer, list-box, add a value 1 4. Preview Expected result: No errors. Actual result: The value "abc" is invalid with the type "integer".
UI/org.eclipse.birt.report.designer.ui.preview/src/org/eclipse/birt/report/designer/ui/preview/editors/ReportPreviewFormPage.java
}
	protected IReportProvider getProvider( )
	{
		IReportProvider provider = (IReportProvider) editor.getAdapter( IReportProvider.class );
		if ( provider == null )
		{
			provider = super.getProvider( );
		}
		return provider;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#getAdapter(java.lang.Class)
	 */
	public Object getAdapter( Class adapter )
	{
		if ( adapter.equals( ActionRegistry.class ) )
		{
			return new ActionRegistry( );
		}
		return super.getAdapter( adapter );
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.forms.editor.IFormPage#initialize(org.eclipse.ui.forms.editor.FormEditor)
	 */
	public void initialize( FormEditor editor )
	{