gs: make it work with empty dir

dvc/remote/gs.py

@@ -148,8 +148,16 @@ class RemoteGS(RemoteBASE):
 
     def walk_files(self, path_info):
         for fname in self._list_paths(path_info.bucket, path_info.path):
+            # skip nested empty directories
+            if fname.endswith("/"):
+                continue
             yield path_info.replace(fname)
 
+    def makedirs(self, path_info):
+        self.gs.bucket(path_info.bucket).blob(
+            (path_info / "").path
+        ).upload_from_string("")
+
     def isdir(self, path_info):
         dir_path = path_info / ""
         return bool(

tests/func/test_remote_dir.py

@@ -83,6 +83,7 @@ def remote_gs():
     put_object("data/subdir/1", "1")
     put_object("data/subdir/2", "2")
     put_object("data/subdir/3", "3")
+    put_object("data/subdir/4/", "")
 
     yield remote