[OE-core] [PATCH] wic/engine.py: improve error message when required tools are missing

[Anuj Mittal]

Instead of showing that command 'None' was found, show the name of
actual command that wasn't found on the host machine or at the native
sysroot path provided by user.

Signed-off-by: Anuj Mittal <anuj.mittal at intel.com>
---
 scripts/lib/wic/engine.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/scripts/lib/wic/engine.py b/scripts/lib/wic/engine.py
index edcfab39ef..94992365df 100644
--- a/scripts/lib/wic/engine.py
+++ b/scripts/lib/wic/engine.py
@@ -284,8 +284,8 @@ class Disk:
             aname = "_%s" % name
             if aname not in self.__dict__:
                 setattr(self, aname, find_executable(name, self.paths))
-                if aname not in self.__dict__:
-                    raise WicError("Can't find executable {}".format(name))
+                if aname not in self.__dict__ or self.__dict__[aname] is None:
+                    raise WicError("Can't find executable '{}'".format(name))
             return self.__dict__[aname]
         return self.__dict__[name]
 
-- 
2.17.0