fixed the funder DOI to the correct DOI that resolves
added a tryCatch to give a more helpful error message as described in situations like #183 where the NSF API is down (first time really using tryCatch so let me know if I implemented in a weird way)
tryCatchto give a more helpful error message as described in situations like #183 where the NSF API is down (first time really using tryCatch so let me know if I implemented in a weird way)