[FS#758] factory image for ubnt er-x missing

[LEDE Bugs]

The following task has a new comment added:

FS#758 - factory image for ubnt er-x missing
User who did this - Daniel Golle (dangowrt)

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Finally really fixed on master branch with [[https://git.lede-project.org/?p=source.git;a=commit;h=d17cb4a68a4544dca690629ee9a2483da29fa42a|commit d17cb4a68a]].
Discussion on how to backport it to lede-17.01 is still ongoing, see [[http://lists.infradead.org/pipermail/lede-dev/2017-May/007290.html|this post on the lede-dev list]]
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=758#comment2558