ui: Fix empty SVG height

[kaxcode]

Adding a conditional that prevents the Topology view from breaking when there are no upstreams in the upstream column.

Before

After

[johncowen]

Hey 👋!

I'm not 100% sure what this fixes, could you add something to the description for me?

Apart from that I left a little inline comment suggestion.

[kaxcode]

Hey 👋!

I'm not 100% sure what this fixes, could you add something to the description for me?

Apart from that I left a little inline comment suggestion.

@johncowen I've added a description.

[johncowen]

Hey thanks for fixing this up. I was wondering if this is a good opportunity to add some additional testing around this somewhere. What do you think? We could test for 0 'streams in each column and make sure no errors are thrown?

[kaxcode]

Hey thanks for fixing this up. I was wondering if this is a good opportunity to add some additional testing around this somewhere. What do you think? We could test for 0 'streams in each column and make sure no errors are thrown?

@johncowen I'll have to leave this for GA. I'm going to be changing some things for that *(All Services) card.

[johncowen]

LGTM! One little thing, I think when we spoke you mentioned changing the changelog a little, not sure if you are going to do that or not.