Bug 210496 Add hasStyle property in reportItemModel extension point
When chart gets reportItem's properties by extending ReportItem, style properties are null. Hence, model needs to add hasStyle property in reportItemModel extension point
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ElementDefn.java
{
	/**
	 * The property is hidden in the property sheet.
	 */
	protected final static String HIDDEN_IN_PROPERTY_SHEET = "hide"; 
	/**
	 * The property is shown in the property sheet but readonly.
	 */
	protected final static String READONLY_IN_PROPERTY_SHEET = "readonly"; 
	/**
	 * Whether this definition represents an abstract element that the user
	 * normally does not see. Abstract elements exist to organize the element
	 * system.
	 */
	protected boolean abstractElement = false;
	/**
	 * The name of base element, if any, from which this element extends.
	 */
	protected String extendsFrom = null;
	/**
	 * The parent Element meta-data object (specified by the "extendsFrom"
	 * value).
	 */
	protected ElementDefn parent = null;