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Thomas Haller authored
nmovpn_arg_is_set() expresses the concept of whether a data key is present, whether it should be considered as set or unset. That is, in many cases an empty value is treated like a missing/unset key. This concept is not only revevant during export, but everytime we access the setting, like when initializing the GUI or when passing the argument to openvpn. Hence, move it to shared/utils.h.
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