[OE-core] [PATCH] oe.types.boolean: treat None as False

[Binghua Guan]

It is better to return False for None. E.g. checking an undefined
variable returned d.getVar().

Signed-off-by: Binghua Guan <freebendy at gmail.com>
---
 meta/lib/oe/types.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/meta/lib/oe/types.py b/meta/lib/oe/types.py
index f778c1d..f401713 100644
--- a/meta/lib/oe/types.py
+++ b/meta/lib/oe/types.py
@@ -103,8 +103,11 @@ def boolean(value):
     """OpenEmbedded 'boolean' type
 
     Valid values for true: 'yes', 'y', 'true', 't', '1'
-    Valid values for false: 'no', 'n', 'false', 'f', '0'
+    Valid values for false: 'no', 'n', 'false', 'f', '0', None
     """
+    if value is None:
+        return False
+
     if isinstance(value, bool):
         return value
 
-- 
2.7.4