emacs: catch errors during initialization of type-buffer
emacs: catch errors during initialization of type-buffer

Buffer is not backed by file, ocp-indent fails in this case.

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