Fix article test

tests/dummy/fixtures/fwd.py

@@ -110,10 +110,11 @@ def dummy_config_fwd(ref_dummy, request):
         if os.path.isdir(target_dir):
             shutil.rmtree(target_dir)
         
-        shutil.copytree(
-            "{}/obsvect".format(tmpdir_str),
-            target_dir
-        )
+        if os.path.isdir("{}/obsvect".format(tmpdir_str)):
+            shutil.copytree(
+                "{}/obsvect".format(tmpdir_str),
+                target_dir
+            )
         
         # Copy the H matrix to avoid re-compiling it every time
         Hfile_ref = "{}/model/H_matrix.pickle".format(tmpdir_str)
@@ -121,5 +122,6 @@ def dummy_config_fwd(ref_dummy, request):
         
         if os.path.isfile(Hfile_target):
             os.remove(Hfile_target)
-            
-        shutil.copy(Hfile_ref, Hfile_target)
+        
+        if os.path.isfile(Hfile_ref):
+            shutil.copy(Hfile_ref, Hfile_target)