From ff57e785f8629b4b804f73079fb87f580842b884 Mon Sep 17 00:00:00 2001
From: Douglas Raillard <douglas.raillard@arm.com>
Date: Tue, 28 Sep 2021 14:37:46 +0100
Subject: [PATCH] exception: Deal with missing _message attribute

Allow subclasses of DevlibError to not have a _message attribute, in
which case it falls back on str(self), just as when _message is None.
---
 devlib/exception.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/devlib/exception.py b/devlib/exception.py
index 7e93465..7776c86 100644
--- a/devlib/exception.py
+++ b/devlib/exception.py
@@ -22,10 +22,15 @@ class DevlibError(Exception):
 
     @property
     def message(self):
-        if self._message is not None:
-            return self._message
-        else:
+        try:
+            msg = self._message
+        except AttributeError:
+            msg = None
+
+        if msg is None:
             return str(self)
+        else:
+            return self._message
 
 
 class DevlibStableError(DevlibError):