Port Forwarding: Warning/error dialog should pop up if there is no oc binary when opening Port forwarding dialog

ASSERT: Have a OpenShift 3 connection with project in OpenShift Explorer View. EXEC: Set incorrect path to OpenShift oc binary in preferences (type some invalid string or path non-leading to oc binary) and press Esc or close dialog. EXEC: Create a new OpenShift 3 application (I created eap-basic s2i from server template) ASSERT: Application is running (there is a succeeded pod for build called eap-app-1-build and there is a running pod with name eap-app-1-* where * is some string/hash) EXEC: Select running pod and open its context menu. EXEC: Select Port Forwarding... context menu. RESULT: Dialog Application Port Forwarding is opened. EXPECTED RESULT: Warning/Error dialog about oc should be shown.