857cb1f38abfc3f467b6a8e53ae54365e05fcff2,deeplabcut/generate_training_dataset/labeling_toolbox.py,MainFrame,browseDir,#MainFrame#Any#,348

Before Change

        oldBodyParts = self.dataFrame.columns.get_level_values(1)
        _, idx = np.unique(oldBodyParts, return_index=True)
        oldbodyparts2plot =  list(oldBodyParts[np.sort(idx)])
        self.new_bodyparts =  list(set(self.bodyparts) - set(oldbodyparts2plot))

// Checking if user added a new label
        if self.new_bodyparts==[]: // i.e. no new label

After Change

            self.prev.Enable(True)
            
// Finds the first empty row in the dataframe and sets the iteration to that index
            for idx,j in enumerate(self.dataFrame.index):
                values = self.dataFrame.loc[j,:].values
                if np.prod(np.isnan(values)) == 1:
                    self.iter = idx
                    break
                else:
                    self.iter = idx
                    
        except:
            a = np.empty((len(self.index),2,))
            a[:] = np.nan
            for bodypart in self.bodyparts:

Instances