tested

rowers/forms.py

@@ -1478,15 +1478,18 @@ class FusionMetricChoiceForm(ModelForm):
                          value in self.fields['columns'].choices}
 
             for label in labeldict:
-                if df.loc[:, label].std() == 0:
-                    try:
-                        formaxlabels2.pop(label)
-                    except KeyError:  # pragma: no cover
-                        pass
+                try:
+                    if df.loc[:, label].std() == 0:
+                        try:
+                            formaxlabels2.pop(label)
+                        except KeyError:  # pragma: no cover
+                            pass
+                except KeyError:  # pragma: no cover
+                    formaxlabels2.pop(label)
 
-                    metricchoices = list(
-                        sorted(formaxlabels2.items(), key=lambda x: x[1]))
-                    self.fields['columns'].choices = metricchoices
+            metricchoices = list(
+                sorted(formaxlabels2.items(), key=lambda x: x[1]))
+            self.fields['columns'].choices = metricchoices
 
 
 class PlannedSessionSelectForm(forms.Form):