[FS#693] /etc/config/ucitrack will contains empty repeating sections that multiply on each sysupgrade

[LEDE Bugs]

The following task is now closed:

FS#693 - /etc/config/ucitrack will contains empty repeating sections that multiply on each sysupgrade
User who did this - Yousong Zhou (yousong)

Reason for closing: Fixed
More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=693