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
* 
	 * @return The name of the base element, if any.
	 */
	public String getExtends( )
	{
		return extendsFrom;
	}
	/**
	 * Gets the java class of this element.
	 * 
	 * @return The java class of this element.
	 */
	public String getJavaClass( )
	{
		return javaClass;
	}
	/**
	 * Indicates if this element has a style.
	 * 
	 * @return Returns whether the element has a style.
	 */
	public boolean hasStyle( )
	{
		return hasStyle;
	}
	/**
	 * Sets whether the element has style properties.
	 * 
	 * @param flag
	 *            True if this element supports style properties, false if not.