utils: Avoid traceback errors

Avoid errors like:

ERROR: Exception handler error: 'NoneType' object has no attribute 'decode'

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/lib/bb/utils.py b/lib/bb/utils.py
index c4b25b50ac668b661c8d91f3856a010a98aee18b..9073f15ea24895a74817b417f3bddc05872c1713 100644 (file)
--- a/lib/bb/utils.py
+++ b/lib/bb/utils.py
@@ -378,7 +378,7 @@ def _print_exception(t, value, tb, realfile, text, context):
 
         # If the exception is from spwaning a task, let's be helpful and display
         # the output (which hopefully includes stderr).
-        if isinstance(value, subprocess.CalledProcessError):
+        if isinstance(value, subprocess.CalledProcessError) and value.output:
             error.append("Subprocess output:")
             error.append(value.output.decode("utf-8", errors="ignore"))
     finally: