Update app.py

app.py

@@ -38,7 +38,7 @@ def test(input_json):
         decay_factors = np.exp(-alpha * DistanceMatrix) * (DistanceMatrix <= threshold)
         subdomainsAccessibility = pd.DataFrame(index=DistanceMatrix.index, columns=weightsNames) #destinationWeights.columns)
         # for weighted accessibility (e. g. areas)
-        if destinationWeights!=None:
+        if not destinationWeights.empty:
             for col,columnName in zip(destinationWeights.columns, weightsNames):
                 subdomainsAccessibility[columnName] = (decay_factors * destinationWeights[col].values).sum(axis=1)
         # for unweighted accessibility (e. g. points of interest)