Bug 122850 Table/list should not be able to be inserted in Master Page mode.
Description: Table/list should not be able to be inserted in Master Page mode. Steps to reproduce: 1. New a report and transfer to Master Page mode. 2. New a datasource and dataset 3. Drag a list/table to page header/footer, bind it to dataset and drag some columns inside. 4. Save and preview Expected result: Insert list/table item in master page should be forbidden. Actual result: They are allowed and preview showed "undefine" in page
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/validators/TableHeaderContextContainmentValidator.java
list
						.add( new ContentException(
								curContainer,
								curSlotID,
								toValidate,
								ContentException.DESIGN_EXCEPTION_INVALID_CONTEXT_CONTAINMENT ) );
			}
			curSlotID = curContainer.getContainerSlot( );
			curContainer = curContainer.getContainer( );
		}
		return list;
	}
	/**
	 * Validates whether the given element can recursively resides in the
	 * specific slot of specific container type when trying to add an element.
	 * 
	 * @param module
	 *            the module
	 * @param element
	 *            the container element
	 * @param slotId
	 *            the slot where the new element to insert
	 * @param toAdd
	 *            the element to add
	 * 
	 * @return error list, each of which is the instance of
	 *         <code>SemanticException</code>.
	 */
	public List validateForAdding( Module module, DesignElement element,
			int slotId, DesignElement toAdd )