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Description of problem:
journalctl stops working as soon as it encounters an empty journal file

Version-Release number of selected component (if applicable):
rhel7.3
systemd-219-30.el7_3.9.x86_64.rpm

Steps to Reproduce:
1. [root@localhost ~]# touch /var/log/journal/5e7af7ffa712483db4097531bc073648/demo.journal

2.[root@localhost ~]# ls -lh /var/log/journal/5e7af7ffa712483db4097531bc073648/
total 8.1M
-rw-r--r--+ 1 root systemd-journal    0 Jun 28 03:03 demo.journal
-rw-r-----+ 1 root systemd-journal 8.0M Jun 28 03:01 system.journal

Actual results:
[root@localhost ~]# journalctl -f
Error was encountered while opening journal files: Input/output error

Expected results:
[root@localhost ~]# journalctl -f
-- Logs begin at Wed 2017-06-28 02:03:59 EDT. --
Jun 28 02:57:55 localhost.localdomain gnome-session[2631]: File "/usr/lib/python2.7/site-packages/subscription_manager/cert_sorter.py", line 323, in __init__
-
-

Additional info:
Already discussed in upstreams -
https://github.com/systemd/systemd/issues/1669

We are very late in RHEL-7.4 cycle. Moving against RHEL-7.5.

fix merged to staging branch -> https://github.com/lnykryn/systemd-rhel/pull/170 -> post

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0711