Filter changed files lines that are only whitespace
Filter changed files lines that are only whitespace

This fixes the empty case which causes AMD task to get configured with
an empty value for --changedFilePath, which throws as this flag requires
a value.

Test: echo '' | grep -v "\s*" | sed 's|[^ ]* *|--changedFilePath=&|g'
Change-Id: Id8e3893fa81f7dcadbef51987cded4e659f462a8

AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx