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

[LEDE Bugs]

The following task has a new comment added:

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

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This is likely a miniupnpd specific issue, though I cannot find how it can work this way with the one at openwrt-routing [1].  Can you please provide the version of miniupnpd in use?  And if it was a modified version, the diff may also help.

 [1] https://github.com/openwrt-routing/packages/tree/master/miniupnpd
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https://bugs.lede-project.org/index.php?do=details&task_id=693#comment2395