[OE-core] [PATCH V2 2/2] populate_sdk_base: avoid executing empty function

[Chen Qi]

`bitbake uninative-tarball' raises the following warning.

    WARNING: Function  doesn't exist

This is because SDK_PACKAGING_FUNC is set to "" in its recipe.
Anyway, we need to check this variable to avoid executing empty function.

[YOCTO #7598]

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 meta/classes/populate_sdk_base.bbclass | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/meta/classes/populate_sdk_base.bbclass b/meta/classes/populate_sdk_base.bbclass
index 5c07693..7f7a87f 100644
--- a/meta/classes/populate_sdk_base.bbclass
+++ b/meta/classes/populate_sdk_base.bbclass
@@ -94,7 +94,9 @@ fakeroot python do_populate_sdk() {
 
     bb.build.exec_func("tar_sdk", d)
 
-    bb.build.exec_func(d.getVar("SDK_PACKAGING_FUNC", True), d)
+    sdk_packaging_func = d.getVar("SDK_PACKAGING_FUNC", True) or ""
+    if sdk_packaging_func.strip():
+        bb.build.exec_func(d.getVar("SDK_PACKAGING_FUNC", True), d)
 }
 
 fakeroot create_sdk_files() {
-- 
1.9.1