bug fixes

rowers/models.py

@@ -4193,6 +4193,13 @@ class WorkoutForm(ModelForm):
         else:
             del self.fields['plannedsession']
 
+    def clean(self):
+        if any(self.errors):
+            return
+        cd = self.cleaned_data
+        if cd['duration'] is None or cd['duration'] == '':
+            raise forms.ValidationError('Duration cannot be empty')
+
 # Used for the rowing physics calculations