The Component Manager page is not loading: «Couldn't get available versions for package mage2pro/core»

Issues
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3

It is a Magento 2 core bug:
https://github.com/magento/magento2/issues/6718

The bug is not reproduced in the Magento 2.2 (the current develop branch).
But it remains in the Magento 2.1.5.