avoid adding to existing data, i.e. when reading a file

python/damask/_configmaterial.py

@@ -11,11 +11,10 @@ class ConfigMaterial(Config):
                  'homogenization': {},
                  'phase': {}}
 
-    def __init__(self,d={}):
+    def __init__(self,d=_defaults):
         """Initialize object with default dictionary keys."""
         super().__init__(d)
-        for k,v in self._defaults.items():
+
-            if k not in self: self[k] = v
 
     def save(self,fname='material.yaml',**kwargs):
         """