Bug 147676 [regression]Visibility set in the first col will affect the second col
Description: Visibility set in the first col will affect the second col Steps to reproduce: 1. Insert a grid(3*3), insert contents to each cell. 2.Set the first col to hide all in visibility and preview Expected result: Only the first col is hidden. Actual result: The second col is hidden, too. If you set the second col in step2, the third col will disappear.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/parser/EngineIRVisitor.java
VisibilityDesign visibility = createVisibility( visibilityIter );
		element.setVisibility( visibility );
	}
	protected String createExpression( String expr )
	{
		if ( expr != null && !expr.trim( ).equals( "" ) )
		{
			return expr;
		}
		return null;
	}
	/**
	 * create a Action.
	 * 
	 * @param handle
	 *            action in DE
	 * @return action in Engine.
	 */
	protected ActionDesign createAction( ActionHandle handle )
	{
		ActionDesign action = new ActionDesign( );
		String linkType = handle.getLinkType( );
		if ( EngineIRConstants.ACTION_LINK_TYPE_HYPERLINK.equals( linkType ) )
		{
			action.setHyperlink( createExpression( handle.getURI( ) ) );
			action.setTargetWindow( handle.getTargetWindow( ) );
		}
		else if ( EngineIRConstants.ACTION_LINK_TYPE_BOOKMARK_LINK
				.equals( linkType ) )
		{