bug fix

rowers/dataprep.py

@@ -1875,9 +1875,10 @@ def read_cols_df_sql(ids, columns, convertnewtons=True):
         cls += column + ', '
     cls = cls[:-2]
     if len(ids) == 0:
-        query = sa.text('SELECT {columns} FROM strokedata WHERE workoutid=0'.format(
-            columns=cls,
-        ))
+        return pd.DataFrame(),extracols
+    #        query = sa.text('SELECT {columns} FROM strokedata WHERE workoutid=0'.format(
+    #            columns=cls,
+    #        ))
     elif len(ids) == 1:
         query = sa.text('SELECT {columns} FROM strokedata WHERE workoutid={id}'.format(
             id=ids[0],