Use the default value for a TopologyOption if omitted #3165
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Without this, we see unmanaged, uncontained or not-running containers in the graph until the front-end requests them to go away.
There was a shouty comment saying not to use the default, but I can't see any reason to take that stance. There is only one place where
""
is a valid value, which is namespaces, and it is also the default there.To be safe, I changed the code to distinguish a lack of value from
""
so you can have both.