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 trigger definition set to merge
	 */
	private void mergeTriggerDefnSet( SemanticTriggerDefnSet toMerge )
	{
		List triggerDefns = toMerge.getTriggerList( );
		if ( triggerDefns == null || triggerDefns.isEmpty( ) )
			return;
		Iterator iter = triggerDefns.iterator( );
		while ( iter.hasNext( ) )
		{
			SemanticTriggerDefn triggerDefn = (SemanticTriggerDefn) iter.next( );
			String targetName = triggerDefn.getTargetElement( );
			if ( StringUtil.isBlank( targetName ) )
			{
				getTriggerDefnSet( ).add( triggerDefn );
			}
			else
			{
				ElementDefn targetDefn = (ElementDefn) MetaDataDictionary
						.getInstance( ).getElement( targetName );
				if ( isKindOf( targetDefn ) )
				{
					getTriggerDefnSet( ).add( triggerDefn );
				}
			}
		}
	}
	/**
	 * Checks the xml name for this element. Check the xml name is not empty and
	 * unique.