added if None line for distfun

Author: Kully

plotly/tools.py

@@ -6208,7 +6208,8 @@ def create_dendrogram(X, orientation="bottom", labels=None,
         if len(s) != 2:
             exceptions.PlotlyError("X should be 2-dimensional array.")
 
-        distfun = scs.distance.pdist
+        if distfun is None:
+            distfun = scs.distance.pdist
 
         dendrogram = _Dendrogram(X, orientation, labels, colorscale,
                                  distfun=distfun, linkagefun=linkagefun)
@@ -7160,7 +7161,9 @@ def __init__(self, X, orientation='bottom', labels=None, colorscale=None,
             self.sign[self.yaxis] = 1
         else:
             self.sign[self.yaxis] = -1
-        distfun = scs.distance.pdist
+
+        if distfun is None:
+            distfun = scs.distance.pdist
 
         (dd_traces, xvals, yvals,
             ordered_labels, leaves) = self.get_dendrogram_traces(X, colorscale, distfun, linkagefun)