Problem: False warnings shown during upgrade/install

[weex]

Describe the bug

There are many warnings that show up during upgrade which are not warnings but simply improperly captured output.

Context

During upgrade of Ecko and probably during installation a series of warnings pops up.

Steps to reproduce

Install or upgrade Ecko on a YunoHost server.

Expected behavior

There should be no warnings unless something is actually out of the ordinary.

Logs

Example semi-scary image during upgrade.