[PATCH 2/2] wic: check if BBLAYERS is valid before use

["João Henrique Ferreira de Freitas" <joaohf@gmail.com>]

If wic is running as raw mode, it's better to check if BBLAYERS
is valid before inspect it.

No functional changes.

Signed-off-by: João Henrique Ferreira de Freitas <joaohf@gmail.com>
---
 scripts/lib/image/engine.py | 7 ++++---
 scripts/lib/mic/plugin.py   | 7 ++++---
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/scripts/lib/image/engine.py b/scripts/lib/image/engine.py
index 3bda1bf..1256236 100644
--- a/scripts/lib/image/engine.py
+++ b/scripts/lib/image/engine.py
@@ -96,9 +96,10 @@ def build_canned_image_list(dl):
     layers_path = get_bitbake_var("BBLAYERS")
     canned_wks_layer_dirs = []
 
-    for layer_path in layers_path.split():
-        path = os.path.join(layer_path, SCRIPTS_CANNED_IMAGE_DIR)
-        canned_wks_layer_dirs.append(path)
+    if layers_path is not None:
+        for layer_path in layers_path.split():
+            path = os.path.join(layer_path, SCRIPTS_CANNED_IMAGE_DIR)
+            canned_wks_layer_dirs.append(path)
 
     path = os.path.join(dl, CANNED_IMAGE_DIR)
     canned_wks_layer_dirs.append(path)
diff --git a/scripts/lib/mic/plugin.py b/scripts/lib/mic/plugin.py
index dec0e5b..585fd6d 100644
--- a/scripts/lib/mic/plugin.py
+++ b/scripts/lib/mic/plugin.py
@@ -53,9 +53,10 @@ class PluginMgr(object):
             self.layers_path = get_bitbake_var("BBLAYERS")
         layer_dirs = []
 
-        for layer_path in self.layers_path.split():
-            path = os.path.join(layer_path, SCRIPTS_PLUGIN_DIR, ptype)
-            layer_dirs.append(path)
+        if self.layers_path is not None:
+            for layer_path in self.layers_path.split():
+                path = os.path.join(layer_path, SCRIPTS_PLUGIN_DIR, ptype)
+                layer_dirs.append(path)
 
         path = os.path.join(dl, ptype)
         layer_dirs.append(path)
-- 
1.9.1