[PATCH] package_ipk.bbclass: handle only whitespace in PACKAGE_EXCLUDE

[Andre McCurdy <armccurdy@gmail.com>]

If PACKAGE_EXCLUDE is constructed using _append then it's possible
that the final value will contain only a space. Currently that
results in build failures due to an invalid opkg command line.

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
---
 meta/classes/package_ipk.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/package_ipk.bbclass b/meta/classes/package_ipk.bbclass
index 8439cda..6c1fdaa 100644
--- a/meta/classes/package_ipk.bbclass
+++ b/meta/classes/package_ipk.bbclass
@@ -12,7 +12,7 @@ OPKGBUILDCMD ??= "opkg-build"
 
 OPKG_ARGS += "--force_postinstall --prefer-arch-to-version"
 OPKG_ARGS += "${@['', '--no-install-recommends'][d.getVar("NO_RECOMMENDATIONS") == "1"]}"
-OPKG_ARGS += "${@['', '--add-exclude ' + ' --add-exclude '.join((d.getVar('PACKAGE_EXCLUDE') or "").split())][(d.getVar("PACKAGE_EXCLUDE") or "") != ""]}"
+OPKG_ARGS += "${@['', '--add-exclude ' + ' --add-exclude '.join((d.getVar('PACKAGE_EXCLUDE') or "").split())][(d.getVar("PACKAGE_EXCLUDE") or "").strip() != ""]}"
 
 OPKGLIBDIR = "${localstatedir}/lib"
 
-- 
1.9.1