Closing date non visualizzata in Open calls

[paolo-tonella]

E' sparita Closing date in Open calls (ricompare solo se number_of_positions = 0).

[napo]

gulp! corretto qui https://github.com/phdfbk/phdfbk.github.io/commit/9a6e1c8c60125c3828b53ac89ac38806a1383622