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/PeerExtensionLoader.java
* @param elementDefn
		 *            element definition
		 * @return name of the element type
		 * @throws ExtensionException
		 *             if the class some attribute specifies can not be
		 *             instanced.
		 */
		String loadElementType( IConfigurationElement elementTypeTag )
		{
			
			String name = elementTypeTag.getAttribute( NAME_ATTRIB );
			if ( !checkRequiredAttribute( NAME_ATTRIB, name ) )
				return null;
			return name;
		}
		/**
		 * Determines whether the element type is invalid or not. Now only
		 * support(ReportItem, Column, Row, Cell, ListingGroup).
		 * 
		 * @param type
		 *            the type
		 * @return true if the type is valid, otherwise false
		 */
		boolean isValidElementType( String type )
		{
			if ( ReportDesignConstants.EXTENDED_ITEM.equalsIgnoreCase( type )
					|| ReportDesignConstants.COLUMN_ELEMENT
							.equalsIgnoreCase( type )
					|| ReportDesignConstants.ROW_ELEMENT
							.equalsIgnoreCase( type )