Comment 3 for bug 1786508

Bionic verification:

Confirming bug:
ubuntu@bionic-exim4-1786508:~$ apt-cache policy exim4
exim4:
  Installed: 4.90.1-1ubuntu1
  Candidate: 4.90.1-1ubuntu1
  Version table:
 *** 4.90.1-1ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        100 /var/lib/dpkg/status

ubuntu@bionic-exim4-1786508:~$ eximstats
Use of uninitialized value $ARGV[0] in string eq at /usr/sbin/eximstats line 563.
**** No valid log lines read

# cron test
ubuntu@bionic-exim4-1786508:~$ sudo vi /etc/cron.daily/exim4-base
ubuntu@bionic-exim4-1786508:~$ echo hello | mail -s hello ubuntu@localhost
ubuntu@bionic-exim4-1786508:~$ sudo /etc/cron.daily/exim4-base
Use of uninitialized value $ARGV[0] in string eq at /usr/sbin/eximstats line 563.
ubuntu@bionic-exim4-1786508:~$

Confirming fix:
ubuntu@bionic-exim4-1786508:~$ apt-cache policy exim4
exim4:
  Installed: 4.90.1-1ubuntu1.1
  Candidate: 4.90.1-1ubuntu1.1
  Version table:
 *** 4.90.1-1ubuntu1.1 500
        500 http://br.archive.ubuntu.com/ubuntu bionic-proposed/main amd64 Packages
        100 /var/lib/dpkg/status
     4.90.1-1ubuntu1 500
        500 http://br.archive.ubuntu.com/ubuntu bionic/main amd64 Packages

# no warning
ubuntu@bionic-exim4-1786508:~$ eximstats
**** No valid log lines read

# clean cron
ubuntu@bionic-exim4-1786508:~$ echo hello | mail -s hello ubuntu@localhost
ubuntu@bionic-exim4-1786508:~$ sudo /etc/cron.daily/exim4-base
ubuntu@bionic-exim4-1786508:~$