adding the fix for Reshape.infer_shape

theano/tensor/basic.py

@@ -4417,7 +4417,7 @@ class Reshape(Op):
                     if ele == -1:
                         requ[i] = missing
             elif crit == 1:  # we reshape to -1
-                requ = [mul(*ishapes[0])]
+                requ = [mul(*ishapes[0])] if ishapes[0] else [1]
             elif crit > 1:
                 raise ValueError('shape argument to Reshape.perform'
                                  ' must have at most one entry equal to -1')