yocto-compat-layer.py: Fix trace when layers can't be processed

When all of the requested layers have unsatisfied dependencies, an error
can occur.  Check for the condition to avoid the traceback:

Traceback (most recent call last):
  File "../scripts/yocto-compat-layer.py", line 203, in <module>
    ret =  main()
  File "../scripts/yocto-compat-layer.py", line 194, in main
    if not results[layer_name].wasSuccessful():
AttributeError: 'NoneType' object has no attribute 'wasSuccessful'

(From OE-Core rev: 32c9b3d99a0c27f6736696082b9da812a8464bf8)

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/yocto-compat-layer.py b/scripts/yocto-compat-layer.py
index a16974f98f..9a541c66e5 100755
--- a/scripts/yocto-compat-layer.py
+++ b/scripts/yocto-compat-layer.py
@@ -191,7 +191,7 @@ def main():
         logger.info('')
         for layer_name in results_status:
             logger.info('%s ... %s' % (layer_name, results_status[layer_name]))
-            if not results[layer_name].wasSuccessful():
+            if not results[layer_name] or not results[layer_name].wasSuccessful():
                 ret = 2 # ret = 1 used for initialization errors
 
     cleanup_bblayers(None, None)