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Description of problem:
When user does not specify file name in `--certificate-out`, command does not raise error "Filename is empty"

[root@vm-idm-010 ~]# ipa cert-show 1 --certificate-out=
  Issuing CA: ipa
  Certificate: <snipped>/eoZcrUgTVtUk7qapoBfFf/iUE=
  Subject: CN=Certificate Authority,O=TESTRELM.TEST
  Issuer: CN=Certificate Authority,O=TESTRELM.TEST
  Not Before: Wed Apr 12 05:05:02 2017 UTC
  Not After: Sun Apr 12 05:05:02 2037 UTC
  Serial number: 1
  Serial number (hex): 0x1
  Revoked: False

Version-Release number of selected component (if applicable):
ipa-server-4.5.0-5.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1. ipa cert-show 1 --certificate-out=

Actual results:
Certificate is shown at stdout

Expected results:
Command should complain as "Filename is empty"

Upstream ticket:
https://pagure.io/freeipa/issue/6885

Fixed upstream
master:
https://pagure.io/freeipa/c/1ed1717e9956ba5a3baa9d0992e14fd2d4a2dd6a
ipa-4-5:
https://pagure.io/freeipa/c/9ce5d6bf36e669f40099a8468f3a664795df06b4

Verified using IPA version :: ipa-server-4.5.0-14.el7.x86_64

Marking BZ as verified. See attachment for console log.

Created attachment 1285320 [details]
console.log

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-2017:2304