Bug 163018 An error extension will lead the report contain chart can't be opened and can not new a report.
Details: An error extension will lead the report contain chart can't open In org.eclipse.birt.report.tests.model has an error extension. When run the birt use workbenck, the report contain chart can't be opened and it can not new a report.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/metadata/ObjectDefn.java
*/
	void addProperty( PropertyDefn property ) throws MetaDataException
	{
		assert property != null;
		String name = property.getName( );
		assert name != null && name.trim( ).length( ) != 0;
		if ( properties.containsKey( name ) )
			throw new MetaDataException( new String[]{name, this.name},
					MetaDataException.DESIGN_EXCEPTION_DUPLICATE_PROPERTY );
		properties.put( name, property );
		property.setOwner( this );
	}
	/**
	 * Gets a property definition given the property name.
	 * 
	 * @param propName
	 *            the name of the property to get
	 * @return the property with that name, or null if the property cannot be
	 *         found
	 */
	public IPropertyDefn findProperty( String propName )
	{
		assert propName != null;
		return (PropertyDefn) properties.get( propName );
	}
	/**
	 * Returns an iterator over the property definitions. The
	 * <code>PropertyDefn</code> s in the iterator will be sorted by there
	 * localized names.
	 *