Browse: fix environment generation
Browse: fix environment generation

This should fix regression in environment selection.
When environment is not known at current point, BrowseT use default_env
as a fallback.

Browse.fix_loc or BrowseT.annot were then expected to fill this hole.
… Now this is done :)

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