corrected work per stroke error (wasn't calculated when it could)

rowers/dataprep.py

@@ -1090,6 +1090,7 @@ def read_cols_df_sql(ids,columns):
     # drop columns that are not in offical list
 #    axx = [ax[0] for ax in axes]
     axx = [f.name for f in StrokeData._meta.get_fields()]
+    
     for c in columns:
         if not c in axx:
             columns.remove(c)
@@ -1118,10 +1119,12 @@ def read_cols_df_sql(ids,columns):
             ids = tuple(ids),
         ))
 
+        
     connection = engine.raw_connection()
     df = pd.read_sql_query(query,engine)
-    df = df.fillna(value=0)
 
+    df = df.fillna(value=0)
+    
     try:
         df['peakforce'] = df['peakforce']*lbstoN
     except KeyError:
@@ -1425,7 +1428,7 @@ def dataprep(rowdatadf,id=0,bands=True,barchart=True,otwpower=True,
             try:
                 driveenergy = rowdatadf.ix[:,'driveenergy']
             except KeyError:
-                driveenergy = 0*power
+                driveenergy = power*60/spm
         else:
             driveenergy = data['driveenergy']