Bug 136241 [regression]Preview template in web viewer and pdf didn't get correct effect.
Description: Preview template items in web viewer and pdf didn't get correct effect. Steps to reproduce: 1. Create template items. 2. Preview in Web Viewer and pdf. Expected result: Same effect as in html. Actual result: In web viewer, see only blank box. In pdf, blank page.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/command/ContentCommand.java
{
								
								
								PropertyCommand cmd = new PropertyCommand(
										module, element );
								cmd.removeItem( (ElementPropertyDefn) propDefn,
										item.getElement( ) );
							}
							catch ( SemanticException e )
							{
								assert false;
							}
						}
					}
				}
			}
		}
	}
	/**
	 * Deletes user properties. This will also remove property values from this
	 * element and derived elements.
	 * 
	 * @param obj
	 *            the element to clean up
	 * @throws UserPropertyException
	 *             if an error occurs, but the operation should not fail under
	 *             normal conditions
	 */
	private void dropUserProperties( DesignElement obj )
			throws UserPropertyException