recipetool: create: fix picking up false npm package directories
It is possible for a Node.js module to have node_modules subdirectories
that contain no package.json file (e.g. iotivity-node has such a
directory). It appears these should simply be ignored, or else with the
way the current code works we will get errors later.
(From OE-Core rev:
8c522f1f536270e195c8c73f5c72801495e7b33b)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Armin Kuster <akuster@mvista.com>
