catch the case where directory no longer exists

sometimes people do stupid things. Stupid things should not cause functionality failures.

shared/workspaces/test/test_remote_processing_service.py

@@ -16,7 +16,7 @@
 # You should have received a copy of the GNU General Public License
 # along with Workspaces.  If not, see <https://www.gnu.org/licenses/>.
 from datetime import datetime
-from unittest.mock import patch
+from unittest.mock import patch, MagicMock
 
 from test.test_workflow_info import FakeWorkflowInfo
 from workspaces.system.schema import AbstractFile
@@ -92,6 +92,7 @@ class TestCapoInjector:
     @patch("pathlib.Path.unlink")
     @patch("glob.glob")
     @patch("os.listdir")
+    @patch("pathlib.Path.exists", MagicMock(return_value=True))
     def test_clear_subspace(self, mock_os, mock_glob, mock_remove):
         injector.clear_subspace()
         assert mock_os.call_count == 1