classes/base: get_lic_checksum_file_list imporve validaton of url's

When specify an URL different that supported file:// the function
returns an empty path causing an exception without notice the user
that the URL is Malformed.

[YOCTO #9211]

(From OE-Core rev: 6c28251d3d187b60ceb534055dbd8b4fffd06429)

Signed-off-by: Aníbal Limón <anibal.limon@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/base.bbclass

@@ -105,6 +105,9 @@ def get_lic_checksum_file_list(d):
         # any others should be covered by SRC_URI.
         try:
             path = bb.fetch.decodeurl(url)[2]
+            if not path:
+                raise bb.fetch.MalformedUrl(url)
+
             if path[0] == '/':
                 if path.startswith(tmpdir):
                     continue