replace nan with negative value

rowers/dataprepnodjango.py

@@ -678,7 +678,9 @@ def fitnessmetric_to_sql(m,table='powertimefitnessmetric',debug=False,
                          doclean=False):
     # test if nan among values
     if np.nan in m.values():
-        return 0
+        for key in m.keys():
+            if np.isnan([m[key]]):
+                m[key] = -1
     
     if debug:
         engine = create_engine(database_url_debug, echo=False)