How to set a blank property I'm trying to configure Android M

I would like to set erase a persistent property like 

getprop | grep dhcp
.../...
[dhcp.wlan0.domain]: [acme.com]
.../..


I would like this property became like this :

[dhcp.wlan0.domain]: []


I tried the setprop command with a blank argument and I got an error message :

 setprop dhcp.wlan0.domain 
usage: setprop NAME VALUE

Sets an Android system property.

setprop: Need 2 arguments


I tried [] as argument and the property has been changed like this :

 [dhcp.wlan0.domain]: [[]] 


I believe this last  property is occurring error

Thanks for you help
To pass an empty value, you need to pass an "empty string" – which is usually specified by two quote marks with nothing between them. For your specific command this would look like

setprop dhcp.wlan0.domain ""