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
* @param value
	 *            the release value
	 */
	public void setSince( String value )
	{
		if ( !StringUtil.isBlank( value ) )
			since = value;
	}
	/**
	 * @return the release in which this object was introduced. A value of
	 *         "none" means that the feature is experimental and is not yet
	 *         released.
	 */
	public String getSince( )
	{
		return since;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see java.lang.Object#toString()
	 */
	public String toString( )
	{
		if ( !StringUtil.isBlank( getName( ) ) )
			return getName( );
		return super.toString( );
	}
}