Trivial 'Add a block' block should not be displayed if there is no block to add.
In blocklib.php::block_add_block_ui() we should return null if $missingblocks is empty.
if (empty($missingblocks)) {
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$bc->content = get_string('noblockstoaddhere'); //remove the string from the lang file
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return $bc;
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}
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=>
if (empty($missingblocks)) {
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return null;
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}
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