Comment # 3 on bug 1049595 from Josef Reidinger

reason why nothing is displayed

2017-07-20 15:48:20 <3> linux-7cye(14397) [Ruby] modules/CWM.rb:142 find string
'firewall' without associated widget in StringTerm
#<Yast::Term:0x0055a90a33c328 @value=:VBox, @params=["firewall"]>
2017-07-20 15:48:20 <1> linux-7cye(14397) [Ruby] modules/CWM.rb:143 Known
widgets {"Yast::ServiceTab"=>{"_cwm_key"=>"Yast::ServiceTab", "no_help"=>"",
"label"=>"Service", "handle_events"=>["Yast::ServiceTab"],
"widget"=>#<Yast::Term:0x0055a90a3d2f80 @value=:VBox, @params=["firewall"]>,
"custom_widget"=>nil}, ""=>{"widget"=>#<Yast::Term:0x0055a90a3bf598
@value=:VBox, @params=[#<Yast::Term:0x0055a90a3bf660 @value=:Frame,
@params=["Firewall Settings for SuSEfirewall2", #<Yast::Term:0x0055a90a3bf6d8
@value=:VBox, @params=[#<Yast::Term:0x0055a90a3bfe80 @value=:Left,
@params=[#<Yast::Term:0x0055a90a3bfef8 @value=:CheckBox,
@params=[#<Yast::Term:0x0055a90a3d0398 @value=:id,
@params=["_cwm_open_firewall"]>, #<Yast::Term:0x0055a90a3d0078 @value=:opt,
@params=[:notify]>, "Open Port in &Firewall"]>]>, #<Yast::Term:0x0055a90a3bf778
@value=:Left, @params=[#<Yast::Term:0x0055a90a3bf7f0 @value=:ReplacePoint,
@params=[#<Yast::Term:0x0055a90a3bfa70 @value=:id,
@params=[:_cwm_firewall_status_rp]>, #<Yast::Term:0x0055a90a3bf8e0
@value=:Label, @params=["Firewall is open"]>]>]>]>]>]>, "custom_widget"=>nil,
"help"=>"<p><b><big>Firewall Settings</big></b><br>\nTo open the firewall to
allow access to the service from remote computers,\nset <b>Open Port in
Firewall</b>.<br>This option is available only if the firewall\nis
enabled.</p>", "init"=>#<Yast::FunRef:0x0055a90a067030 @remote_method=#<Method:
Yast::CWMFirewallInterfacesClass#OpenFirewallInitWrapper>, @signature="void
(string)">, "store"=>#<Yast::FunRef:0x0055a90a066d88 @remote_method=#<Method:
Yast::CWMFirewallInterfacesClass#OpenFirewallStoreWrapper>, @signature="void
(string, map<any,any>)">, "handle"=>#<Yast::FunRef:0x0055a90a066950
@remote_method=#<Method:
Yast::CWMFirewallInterfacesClass#OpenFirewallHandleWrapper>, @signature="symbol
(string, map<any,any>)">, "handle_events"=>["_cwm_firewall_details",
"_cwm_open_firewall"], "services"=>["service:sshd", "service:ntp"]}}

so problem is that key for firewall was empty string, which is a problem.

I can reproduce a problem. It looks like related to usage in tabs. I will work
on fix.