[8.19] [Discover][APM] Check for undefined data from useFetcher in TraceWaterfallEmbeddable (#240843)#241099

iblancof merged 3 commits intoelastic:8.19elastic/kibana:8.19from

iblancof:backport/8.19/pr-240843iblancof/kibana:backport/8.19/pr-240843Copy head branch name to clipboard