Optional element available since 2018.01. By default this element is set to true and FEWS will log a debug message when an empty locationSet is created. If set to false, FEWS will log a config error instead. When separate locationSets xml-files are used, each file can have its own <allowEmptyLocationSets> element, which will only apply for the location sets listed in that file.
Deprecated. Sorting NOT used in dataviewer / filters. Sorting by name has become default, a sorting attribute can be defined in the location set <sortingLocationAttributeId>.
STILL used in exports