Apply miscellaneous refactors (#1576)

Author: tsalo

xcp_d/interfaces/concatenation.py

@@ -227,6 +227,13 @@ def _run_interface(self, runtime):
         if len(successful_runs) < n_runs:
             LOGGER.warning(f'Of {n_runs} runs, only runs {successful_runs} were successful.')
 
+        if not successful_runs:
+            LOGGER.warning('No successful runs found. Returning empty outputs.')
+            self._results['denoised_bold'] = []
+            for input_name in inputs_to_filter:
+                self._results[input_name] = []
+            return runtime
+
         self._results['denoised_bold'] = [denoised_bold[i] for i in successful_runs]
 
         for input_name, input_list in inputs_to_filter.items():

xcp_d/tests/test_utils_utils.py

@@ -471,7 +471,7 @@ def test_get_bold2std_and_t1w_xfms(ds001419_data):
         )
 
     tofail_to_anat_xfm = nlin6asym_to_anat_xfm.replace('from-MNI152NLin6Asym_', 'from-tofail_')
-    with pytest.raises(ValueError, match='Space "tofail"'):
+    with pytest.raises(ValueError, match='BOLD space "tofail" not supported'):
         utils.get_bold2std_and_t1w_xfms(
             bold_file_tofail,
             tofail_to_anat_xfm,