Don't show estimated hours total when there is no time yet
Don't show estimated hours total when there is no time yet

Showing 0 in the total adds noise to the screen when there are no
hours estimated so this change removes it until there is a total to
show.

uktrade/data-hub-frontend,uktrade/data-hub-fe-beta2,uktrade/data-hub-fe-beta2,uktrade/data-hub-frontend,uktrade/data-hub-frontend