Selecting "Relational Storage" without "Multiselect" for list properties causes loss of data during import or rollback

Details

Type: Bug
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: 2.7
Fix Version/s: 2.6.1, 3.0 M1, 2.5.2, 2.7.1
Component/s: {Unused} Core
Labels:
None

Difficulty:
Unknown

Similar issues:

~~XWIKI-4825~~	Altering the storage properties of a DBList or DBTreeList property sometimes fails to save the changes
~~XWIKI-3128~~	BaseClass add*List methods should allow specifying whether relational storage should be used
~~XWIKI-1723~~	multiselect separators are not defined for all list property types
~~XWIKI-9013~~	Multiple Select List values are not correctly indexed by Lucene
~~XWIKI-8959~~	Broken links created in livetables for DBList properties with multiselect activated
~~XWIKI-851~~	Rollback of a document with an attachment to a prior version without this attachment does not rollback the attachment
~~XWIKI-1621~~	Changing parameters of list properties fails
~~XWIKI-7088~~	OpenOffice import attachment error with filsystem storage
~~XWIKI-2942~~	Ability to select relational list property in XWQL
~~XWIKI-1084~~	ListClass does not fill in list with selected values which are not in the list of possible values

Description

This happens because ListClass#newPropertyfromXML expects <value> elements if either of the two is set, but <value> elements exist only if Multiselect is enabled.