Fix incompatibilities with perl 5.22

[jibsheet]

From perldiag

Can't use an array as a reference
    (F) You tried to use an array as a reference, as in "@foo->[23]" or
    "@$ref->[99]". Versions of perl <= 5.22.0 used to allow this syntax,
    but shouldn't have. This was deprecated in perl 5.6.1.

Can't use 'defined(@array)' (Maybe you should just omit the defined()?)
    (F) defined() is not useful on arrays because it checks for an
    undefined scalar value. If you want to see if the array is empty, just
    use "if (@array) { # not empty }" for example.

[statico]

Sweeeet thaaaanks