Fix #47: Make sure that proxy variables added as global config even is they set to empty
Fix #47: Make sure that proxy variables added as global config even is they set to empty

Signed-off-by: Andrey Devyatkin <af5938841ce16a967d6c8f363d3a71fada65538d@gmail.com>

arinzeakubue/JenkinsAsCodeReference,lynochka/JenkinsAsCodeReference,Praqma/JenkinsAsCodeReference,zaikinlv/JenkinsAsCodeReference,zaikinlv/JenkinsAsCodeReference,arinzeakubue/JenkinsAsCodeReference,lynochka/JenkinsAsCodeReference,areguru/JenkinsAsCodeReference,areguru/JenkinsAsCodeReference,Praqma/JenkinsAsCodeReference