Progress bar when only searching for one pipeline is confusing

[kmax12]

To help me debug, I was running automl search with just one pipeline. When I look at the output, it makes feel as if the search is already complete since I see the 100%. Minor issue, but perhaps we can clean up the output

[dsherry]

+1. In the edge case you're describing, where we're only searching one pipeline, we could have the cmdline progress bar show 0% before the pipeline is fitted and 100% after.

But I agree we could also simply omit the progress bar entirely when there's only one pipeline.

[jeremyliweishih]

Related to #245. From what I remember from my experimentation that there wasn't a perfect fix - each implementation resulted in some edge case being off. IIRC I couldn't fix this behavior (new line with new pipeline uses next percentage i.e only pipeline starts with 100%) as the alternative would be for the next pipeline to retain the same percentage which is confusing in another way (i.e first pipeline hits 50% and the next will keep 50% until finished). Might be worth brainstorming options other than TQDM.

[dsherry]

@jeremyliweishih agreed. I think we should move off TQDM. Will reorganize these tickets soon. For the moment let's hold off on working on TQDM-related issues.

[dsherry]

#761 will fix this, keeping it open until then