Bug 13522: Make it explicit that scalar containd a hash ref

Bug 13522: Make it explicit that scalar containd a hash ref

Prior to perl 5.12 keys can only operate on a hash. So although
$data[0] ( thats an abysmal variable name! ) will contain a hash ref
the perl compiler cannot deduce that from the context and gives
a syntax error. Add the hash sigil to make the context explicit and
the compiler can generate the correct code.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>