completion: don't leak exceptions from locate
completion: don't leak exceptions from locate

This is a dirty patch, the good fix would be for locate not to raise.
For memory: the exception comes from the usage of [Path.to_string_list].

fxfactorial/merlin,rgrinberg/merlin,the-lambda-church/merlin,ocaml/merlin,rgrinberg/merlin,the-lambda-church/merlin,fxfactorial/merlin,fxfactorial/merlin,dra27/merlin,dra27/merlin,rgrinberg/merlin,the-lambda-church/merlin,ocaml/merlin,rgrinberg/merlin,dra27/merlin,ocaml/merlin,fxfactorial/merlin,dra27/merlin,ocaml/merlin