Initializing it to an empty string had broken configuring xkbcommon through the environment (XKB_DEFAULT_OPTIONS).
Fixes: ae313911153b ("initialize rules and xkb_rules")
DXX6U6W55AS3IKR76VVGFUSI7XBXAA6X2ZMGFKHWU6YXUFYHOSKQC
IPD7ZNRWFVKAN5L2C3ZEO6CDA3RVK6T7YDVTQFHWASPCLVIBYN4QC
5XQORC75PLJP67TLAYROELKQ7RNQZFZ4PLOWJ7EKAVPNUDCMW2BQC
7B74AT3BXYB7PVW4F6SGQNPMHOU5TEV5TZ54CG6VSQI46XSEKWXQC
.options = "",
.options = NULL,