Check the variable existence first and then set to global if exist
Change-Id: Ib14c3b968141db1f13b736a599aca0e4301ae522
diff --git a/tests/functional/Voltha_FailureScenarios.robot b/tests/functional/Voltha_FailureScenarios.robot
index 45026fa..46b4440 100644
--- a/tests/functional/Voltha_FailureScenarios.robot
+++ b/tests/functional/Voltha_FailureScenarios.robot
@@ -425,7 +425,8 @@
[Documentation] Set up the test suite
Common Test Suite Setup
#power_switch.robot needs it to support different vendor's power switch
- Set Global Variable ${powerswitch_type} ${web_power_switch.type}
+ ${switch_type}= Get Variable Value ${web_power_switch.type}
+ Run Keyword If "${switch_type}"!="" Set Global Variable ${powerswitch_type} ${switch_type}
Clear All Devices Then Create New Device
[Documentation] Remove any devices from VOLTHA and ONOS