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 elementTag
		 *            the element tag
		 * @param propGroupTag
		 *            the property group tag
		 * @param elementDefn
		 *            element definition
		 * @param propList
		 *            the property list into which the new property is added.
		 * 
		 * @throws MetaDataException
		 */
		void loadPropertyGroup( IConfigurationElement elementTag,
				IConfigurationElement propGroupTag,
				ExtensionElementDefn elementDefn, List propList )
				throws MetaDataException
		{
			
			String groupName = propGroupTag.getAttribute( NAME_ATTRIB );
			if ( !checkRequiredAttribute( NAME_ATTRIB, groupName ) )
				return;
			
			String displayNameID = propGroupTag
					.getAttribute( DISPLAY_NAME_ID_ATTRIB );
			String defaultDisplayName = propGroupTag
					.getAttribute( DEFAULT_DISPLAY_NAME_ATTRIB );
			IConfigurationElement[] elements = propGroupTag.getChildren( );
			for ( int i = 0; i < elements.length; i++ )
			{
				if ( PROPERTY_TAG.equalsIgnoreCase( elements[i].getName( ) ) )
				{