Quotes _block hook should return NULL for $op != list || view

To be compliant with the recent block.module improvements, the quotes_block function should not return anything unless $op is "list" or "view". More info here

The current condition results in a useless block-specific settings group containing the word "Array".

This should be an ultra-simple fix... just change (on line 445)
else {
to
else if ($in_operation == 'view') {