Initialize taxonomy map dictionary so that there is always a taxonomy map to...

Initialize taxonomy map dictionary so that there is always a taxonomy map to work with (even if empty)

losscalculator/fragility_model.py

@@ -104,6 +104,7 @@ class FragilityModel:
         self.loss_category = root.attrib["lossCategory"]
         self.fragility_functions = {}
         self.gm_type_column_map = {}
+        self.taxonomy_map = {}
         self.limit_states = None
         self.num_limit_states = 0
         for child in root: