If an ExpansionError occurs during better_exec() we should just raise it
instead of printing the traceback, so that recipe errors (such as broken
URLs in SRC_URI) are more easily comprehensible.
(Bitbake rev: 5b0da8932c318813138c113d2bb20498145dbd42)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>