FastModel: Make ancillary files optional

We don't need all files in all cases:

1) in case of integrated switcher, we just need the .axf file
2) in case of reference switcher, we need axf, zimage, and dtb
3) in case of kvm, we need zimage

1 files changed, 4 insertions, 3 deletions

diff --git a/linaro_image_tools/media_create/boards.py b/linaro_image_tools/media_create/boards.py
index 69033e0..fe9d5c3 100644
--- a/linaro_image_tools/media_create/boards.py
+++ b/linaro_image_tools/media_create/boards.py
@@ -1368,10 +1368,11 @@ class FastModelConfig(BoardConfig):
                          d_img_data):
         output_dir=os.path.dirname(boot_device_or_file)
 
-        copy_drop(_get_file_matching("%s/boot/img.axf" % chroot_dir), output_dir)
+        bootwrapper=_get_file_matching("%s/boot/img.axf" % chroot_dir)
 
-        for filename in (k_img_data, i_img_data, d_img_data):
-            copy_drop(filename, output_dir)
+        for filename in (bootwrapper, k_img_data, i_img_data, d_img_data):
+            if filename != None:
+                copy_drop(filename, output_dir)
 
 class SamsungConfig(BoardConfig):
     @classproperty