Add empty result back

Make fixes as described:
1. This was removed in a recent merge commit. We should add it back. https://github.com/codeforboston/jobhopper/blob/ab13d735538e782bd0f8b6a06ce57d2fc3ff53fe/frontend/src/ui/Results/Results.tsx#L201
2. Add a test where the code is run with a result but no transitions and ensure that the expected result is generated to guard against this behavior in the future.