Update app.py

app.py

@@ -1082,7 +1082,7 @@ if uploaded_files:
                                         L.append({
                                             'Title' : concat['title'][0],
                                             'Author' : concat['authors'][0],
-                                            'Publisher Name' : concat['publisher'][0],
+                                            'Publisher Name' : concat['publisher'][0] if 'publisher' in list(concat.columns) else '',
                                             'Publication Year' : get_valid_year(' '.join(concat['publication_year'].values.tolist())),
                                             'Genes' : '',
                                             'Population' : upper_abbreviation(' '.join(np.unique(concat['population_race'].values.tolist())).title()),