Bugfix for #178 (#179)

* Bugfix for #178

* Keep original code but check for the type of reference_sequence

Author: rfriedman22

selene_sdk/predict/model_predict.py

@@ -173,7 +173,8 @@ def __init__(self,
         self.batch_size = batch_size
         self.features = features
         self.reference_sequence = reference_sequence
-        if not self.reference_sequence._initialized:
+        if type(self.reference_sequence) == Genome and \
+                not self.reference_sequence._initialized:
             self.reference_sequence._unpicklable_init()
         if type(self.reference_sequence) == Genome and \
                 _is_lua_trained_model(model):