gen-sitemap: fix a bug: args.exclude can be None

diff --git a/gen-sitemap.py b/gen-sitemap.py
index aaff97a7c3001f77707b32876da324d3bc20b73a..333069f0122df57fdad96776356d9ed175467509 100755 (executable)
--- a/gen-sitemap.py
+++ b/gen-sitemap.py
@@ -12,10 +12,11 @@ parser.add_argument('root_dir', help='Root dicrectory')
 args = parser.parse_args()
 
 exclude = []
-for pat in args.exclude:
-    exclude.append(pat)
-    if not pat.endswith('/*'):
-        exclude.append(pat + '/*')
+if args.exclude:
+    for pat in args.exclude:
+        exclude.append(pat)
+        if not pat.endswith('/*'):
+            exclude.append(pat + '/*')
 
 os.chdir(args.root_dir)
 fullpath = os.getcwd()