bitbake: tinfoil: fix get_recipe_file() to return an error on invalid recipe

This function calls cooker.findBestProvider() but didn't handle the fact
that that function returns a tuple (None, None, None, None) when there
is no matching recipe. (This fixes devtool in OpenEmbedded showing a
traceback when an invalid recipe is specified instead of a proper error
message.)

(Bitbake rev: 54a4757ca706afc6e98c7692f960592e80cab12b)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

bitbake/lib/bb/tinfoil.py

@@ -363,7 +363,7 @@ class Tinfoil:
         skipped.
         """
         best = self.find_best_provider(pn)
-        if not best:
+        if not best or (len(best) > 3 and not best[3]):
             skiplist = self.get_skipped_recipes()
             taskdata = bb.taskdata.TaskData(None, skiplist=skiplist)
             skipreasons = taskdata.get_reasons(pn)