fix: fixes a nil panic when unable to fetch feature flags

[TristanSpeakEasy]

fixes a nil panic when unable to fetch feature flags and err != nil which means res.Body will be nil at defer time because we aren't returning early enough from the method

[TristanSpeakEasy]

apologies for the slight reformatting gofmt had its way with the file let me know if you want me to revert those changes

[neilkakkar]

makes sense, thanks!