FIX: Test explicitly

Author: larsoner

mne/viz/ica.py

@@ -590,8 +590,6 @@ def _fast_plot_ica_properties(
             inst, ica, reject_by_annotation, reject
         )
     del reject, inst
-    if len(epochs_src) == 0:
-        return [fig]
     epochs_src_picked = epochs_src.pick(picks)
     del epochs_src
     good_indices = np.setdiff1d(np.arange(len(epochs_src_picked)), bad_indices)
@@ -749,6 +747,11 @@ def _prepare_data_ica_properties(inst, ica, reject_by_annotation=True, reject="a
         bad_indices = np.where([len(log) for log in epochs.drop_log])[0]
         kind = "Segment"
         assert len(epochs_src) == len(epochs) + len(bad_indices)
+        if len(epochs_src) == len(bad_indices):
+            raise RuntimeError(
+                f"No clean 2-second segments found out of {len(events)} using "
+                f"{reject=} and {reject_by_annotation=}."
+            )
     else:
         epochs_src = ica.get_sources(inst)
         kind = "Epochs"

mne/viz/tests/test_ica.py

@@ -321,6 +321,8 @@ def test_plot_ica_properties_reject(kind):
     assert min_hist > 0
     scatter_x, _ = var_ax.collections[0].get_offsets().data.T
     assert_array_equal(scatter_x, np.arange(n_epochs))
+    with pytest.raises(RuntimeError, match="No clean"):
+        ica.plot_properties(raw, reject=dict(eeg=1e-6))
 
 
 def test_plot_ica_sources(raw_orig, browser_backend, monkeypatch):