[Commotion-admin] [luci-commotion-apps] Improve DNS override logic (#39)

[areynold]

When making changes on the manual mesh config page, meshconfig says it is removing DNS overrides even when there is no DNS override to remove.

Add a check for existing overrides before entering the override removal loop.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion-apps/issues/39
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