#325 Fix

* fixes bug described in #325

compensation/utils/quality.py

@@ -91,8 +91,9 @@ class EcoAccountQualityChecker(CompensationQualityChecker):
         Returns:
 
         """
-        surface = self.obj.deductable_surface
+        surface = self.obj.deductable_surface or 0
-        if surface is None or surface == 0:
+        is_surface_invalid = surface == 0
+        if is_surface_invalid:
             self._add_missing_attr_name(_("Available Surface"))
         after_state_surface = self.obj.get_state_after_surface_sum()
         if surface > after_state_surface: