cubicweb-rememberme #2154657 request_has_auth_info should detect buggy cookie [validation pending]

currently, if an empty __cw_auth_cookie is retrieved, this method pretend we've authentication information while we haven't.

NB: this occurs with cw pre 3.14.3 due to a bug in remove_cookie

prioritynormal
typebug
done in0.2.4
load0.100
load left0.000
closed by#8d9b8c90d6da request_has_auth_info should detect more cases of buggy cookie (eg. empty value). Closes #2154657