[BUG] Crash when attempting to cycle an instance not attached to an ASG/nodegroup.

[vincentportella]

Describe the bug
Currently if you add a node to cycle in a CNR that isn't attached to an ASG, cyclops crashes because the map of instances generated only includes instances attached to ASGs. When the provider id of the instance is checked in the map, a nil pointer error occurs.

To Reproduce
Apply a CNR with an instance not attached to any ASG.

Expected behavior
Skip the detached instance.

Cyclops Version
v1.0.0, v1.1.0