Do not fail if the method is not defined on the topology graph

[jkremser]

This is a hot-fix for https://bugzilla.redhat.com/show_bug.cgi?id=1446822

Before: 😹 😢 ☁️

After: 🦄 🌈 ☀️

If the model/relationships for topology graph is not specified well it might fail with this error:

[----] F, [2017-04-28T19:05:32.796056 #2206:3fe951523850] FATAL -- : Error caught: [NoMethodError] undefined method `host' for #<ManageIQ::Providers::Kubernetes::ContainerManager::Container:0x007fd2ad585098>
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/gems/activemodel-5.0.2/lib/active_model/attribute_methods.rb:433:in `method_missing'
/opt/rubies/ruby-2.3.1/lib/ruby/gems/2.3.0/bundler/gems/manageiq-ui-classic-70ba36ca1c67/app/services/topology_service.rb:69:in `block in map_to_graph'

Let's make it more robust.

@miq-bot assign @skateman
@miq_bot add_label bug, topology, blocker
/cc @abonas @theute

[miq-bot]

Checked commit jkremser@c1a1213 with ruby 2.2.6, rubocop 0.47.1, and haml-lint 0.20.0
1 file checked, 0 offenses detected
Everything looks fine. ⭐

[skateman]

[abonas]

@miq-bot add_label topology

[simaishi]

@Jiri-Kremser This part of the code was refactored in #1171, which is fine/no, and there is conflict backporting. Please resolve conflict and create a Fine specific PR (referencing this one).

[Fryguy]

@skateman, this PR depends on #1171. Would you feel comfortable with that one being backported? cc @himdel

[skateman]

@Fryguy , I'd rather create a different darga PR, give me a sec.

[skateman]

@simaishi here it is #1226

[jkremser]

@skateman thanks for the PR 👍 , I was already afk

[simaishi]

Backported to Fine via #1226