TT#47906 Fix soundsets POST without contract or customer

Change-Id: I148e475ed1766c0fa7e4cad981402c36ea24818d

lib/NGCP/Panel/Role/API/SoundSets.pm

@@ -69,6 +69,7 @@ sub pre_process_form_resource{
     #So now we allow both, and one documented (contract_id) has higher priority
     my $customer_id = delete $resource->{customer_id};
     $resource->{contract_id} //= $customer_id;
+    return $resource;
 }
 
 sub process_form_resource{

t/api-rest/api-soundsets.t

@@ -36,6 +36,7 @@ $test_machine->DATA_ITEM_STORE($fake_data->process('soundsets'));
 $test_machine->form_data_item( );
 # create 3 new sound sets from DATA_ITEM
 my $soundsets_with_files = $test_machine->check_create_correct( 1, sub{ $_[0]->{name} .=  $_[1]->{i}; } );
+my $soundsets_without_contract = $test_machine->check_create_correct( 1, sub{ delete $_[0]->{contract_id}; } );
 my $soundsets_without_files = $test_machine->check_create_correct( 1, sub{ 
     $_[0]->{name} .=  $_[1]->{i}; 
     $_[0]->{copy_from_default} =  0;