in case a name of a selectbox static value is accidentally emptied - > there is no trivial way to add new one. See screenshots a. BEFORE > b. GOING > c. NOT SELECTABLE
Firstly, the static value becomes a useless orphan for the Tuleap user. This is a minor defect.
Secondly, any attempt to import such tracker after export into XML results in an ERROR. This a critical defect for a Tuleap admin or scrum master. A manual cleanup of XML file is needed in editor to make import attempts successful.
Hence, the overall severity of this Defect is set to 5- Major
01) Empty names in static fields should not be allowed OR substituted with an empty space HTML code like -> <-
See reference: https://www.w3schools.com/html/html_entities.asp
02) XML exports should be sanitized for empty fields.
SIDENOTE: there is a browser devtools hack to manually click an emptied static name field (see d. HACK to Screen Shot), but it assumes skills way beyond general Tuleap user.