bsdperimeter/pfsense — pull request #44 by namezero111111 (2012-02-01 16:16:46+00:00)
Title: SSID should only be required in Access Point mode

SSID should only be required in Access Point mode, because in some scenarios (I have one of these), it may be favorable for the wireless interface in client mode to connect to any unsecured SSID regardless of name.
Since no/any SSID is a legitimate (albeit rare) configuration, the webGUI should allow such a configuration, but make sure the user is aware of the consequences.