I can't pass empty variables when using the plugin.

I want to define empty string for the filed: --public-ip-address.

for example: --public-ip-address "" 

I tried to escape with all the possible combinations with no success. 

--public-ip-address '"'

--public-ip-address """"

'--public-ip-address ""'

etc...

The same command run as expected when using regular bash shell script and not the plugin pipeline or regular Jenkins job.

command for example: az vm create -g "foo" –name "bar" --public-ip-address "" 

 Thanks for your help!