[CentOS] el7 systemd :: usage of AssertPathExists

Hi! I am trying to use AssertPathExists in a systemd unit but it seems 
it not working. Does anyone have problems with this?

i have this in unit :
AssertPathExists=
AssertPathExists=/etc/mlsensor/mlsensor.properties

but then when i start the service i get no errors :
26225 /usr/bin/java -Xms16m -Xmx32m -DMLSENSOR_HOME=/tmp 
-Djava.util.logging.config.class=lia.Monitor.monitor.LoggerConfigClass 
-Dlia.Monitor.ConfigURL=file:/etc/mlsensor/mlsensor.properties -jar 
/usr/share/java/mlsensor/MLSensor.jar

i can't modify the java application, i am just doing an systemd unit for 
it...

Anyone have any experience making systemd unit fail if the configuration 
file is not in place?

Thank you!
Adrian