[monitoring-plugin-perl] output empty values as "U" (#5)

output empty performance data value as value "U" to "indicate that the
actual value couldn't be determined" (defined in
https://nagios-plugins.org/doc/guidelines.html#AEN200) and do valid output
You can view, comment on, or merge this pull request online at:

  https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5

-- Commit Summary --

  * output empty values as "U"

-- File Changes --

    M lib/Monitoring/Plugin/Performance.pm (9)

-- Patch Links --

https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.patch
https://github.com/monitoring-plugins/monitoring-plugin-perl/pull/5.diff

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