Hi,

In file userinfo.tpl.php, line 25:

replace

$user_image_alt= $user->picture->alt;

with

if ($user->picture) {
$user_image_alt= $user->picture->alt;
} else {
$user_image_alt = t("User no image");
}

and replace line 52 with

echo '<img src="' . $base_url . '/' . drupal_get_path('module', 'md_block_custom') . '/add/img/user_not_verified.png" alt="'. $user_image_alt .'" class="img-circle user-avatar" />';

Coud you send us your site url, admin account and FTP account by Private comment? We would like to have a check in your site. 

1. Please tell us which view you could not add custom class or all views?

You could add class for a view by: open view > advance setting > Other => add custom class in CSS Class

2. Please go to /admin/config/media/icon check if you enable or import icon in right way. 

If everything is ok but problems still exit, please try to upload your site to any host so we can check exactly which reason is and find some solutions.

In addition,

with missing cart icon problem, you could try below solution also:
open file sites\all\themes\md_hosoren\theme_setting\front\page.preprocess.inc

after line 6: 

function md_hosoren_preprocess_page(&$vars, $hook) {

insert 

// CALL FONT ICON
$call_icon_font[] = array(
    '#theme' => 'icon',
    '#bundle' => 'theme_font',
    '#icon' => 'icon-floppy',
);
drupal_render( $call_icon_font);

Save and clear cache.