[Commotion-admin] [luci-commotion] fix ssid input validation (#434)

[Josh King]

This works on a configured node, but if you try and enter in a blank mesh network name during setup_wizard, it bombs out with a white screen and "The CGI process did not produce any response." Entering a blank AP SSID during setup_wizard correctly provides the intended error.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion/pull/434#issuecomment-58026875
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