You can do it very easily.
Add this following code at qa-include/plugins/qa-filter-basic.php:51
Than save the page and you will be done..
if (preg_match('/\\s/', $handle)) { return qa_lang_sub('users/handle_has_bad', 'space');}
if (preg_match('/\\s/', $handle)) {
return qa_lang_sub('users/handle_has_bad', 'space');
}
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