call to fusion_block_list in grid_info causes block alters to load twice

to reproduce, use the function hook_block_view_alter and add a dpm() call to any module (with DEVEL enabled):

function MODULENAME_block_view_alter(&$data, $block) {
  dpm($block);
}

You will see that krumo loads the block info twice. By removing the calls to fusion_core_block_list() in fusion_core_grid_info(), it loads them only once. It seems to be because block_list calls out to _block_render_blocks (which is needed here to determine if there is content in the block and if it should be listed). This behavior problematic because loading anything such as drupal_add_css or drupal_add_js in a block_view_alter, causes it to load twice on the page.

Of course, you can band-aid the problem by writing a bit of php that assures the function only loads once, however it shouldn't be necessary and will affect many module developers that use fusion.