[monitoring-plugin-perl] Merge pull request #19 from tejr/ config-read-error

[GitHub]

    Module: monitoring-plugin-perl
    Branch: master
    Commit: f4b90a56b819a219a147860deb3248883f86c0a8
    Author: Sven Nierlein <sven at nierlein.org>
 Committer: GitHub <noreply at github.com>
      Date: Mon May 28 08:55:47 2018 +0200
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugin-perl/commit/?id=f4b90a5

Merge pull request #19 from tejr/config-read-error

Fail with config ->errstr() when undef read

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