Automation fix for VMI testcase

Changes :
  - Modified "Verify Existing VMI Network Interface Details" testcase
Tested :
  - Ran successfully test_vmi.robot

Change-Id: I408c54a57b096c930e05019181aa6dc634ffe2ac
Signed-off-by: Megha G N <Megha.G.N@ibm.com>
diff --git a/openpower/ext_interfaces/test_vmi.robot b/openpower/ext_interfaces/test_vmi.robot
index 1b9f5f0..934f40b 100644
--- a/openpower/ext_interfaces/test_vmi.robot
+++ b/openpower/ext_interfaces/test_vmi.robot
@@ -52,7 +52,8 @@
     Should Be Equal As Strings  ${vmi_ip["Description"]}
     ...  Hypervisor's Virtual Management Ethernet Interface
     Should Be Equal As Strings  ${vmi_ip["Name"]}  Hypervisor Ethernet Interface
-    Should Be True  ${vmi_ip["InterfaceEnabled"]}
+    Run Keyword If  '${vmi_ip["IPv4_Address"]}' != '${default}'
+    ...  Should Be True  ${vmi_ip["InterfaceEnabled"]}
     Run Keyword If   ${vmi_ip["IPv4StaticAddresses"]} != @{empty}
     ...  Verify VMI Network Interface Details  ${vmi_ip["IPv4_Address"]}
     ...  ${origin}  ${vmi_ip["IPv4_Gateway"]}  ${vmi_ip["IPv4_SubnetMask"]}