[PATCH 5/5] oeqa/utils/commands.py: Command class improve validations/decoding in output

["Aníbal Limón" <anibal.limon@linux.intel.com>]

When run a command sometimes the output isn't provided so validate
before trying to encode to utf-8, also some output like BIOS/EFI
contains characters that can't be codified into utf-8 for this reason
set errors='replace'.

[YOCTO #10019]

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
---
 meta/lib/oeqa/utils/commands.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/lib/oeqa/utils/commands.py b/meta/lib/oeqa/utils/commands.py
index 4f79d15..a8e184d 100644
--- a/meta/lib/oeqa/utils/commands.py
+++ b/meta/lib/oeqa/utils/commands.py
@@ -78,7 +78,10 @@ class Command(object):
                 self.process.kill()
                 self.thread.join()
 
-        self.output = self.output.decode("utf-8").rstrip()
+        if not self.output:
+            self.output = ""
+        else:
+            self.output = self.output.decode("utf-8", errors='replace').rstrip()
         self.status = self.process.poll()
 
         self.log.debug("Command '%s' returned %d as exit code." % (self.cmd, self.status))
-- 
2.1.4