newt - Warn instead of fail on broken links.
newt - Warn instead of fail on broken links.

--Before change--

If newt failed to enter a directory while scanning for packages, it
aborted the scan with an error.  This could be annoying because one
broken link in the project would make newt think no packages are
present.

--Now--

newt warns about the issue and continues the scan.

apache/incubator-mynewt-newt,apache/incubator-mynewt-newt