fix: add get data to faultdisplacement feature

Author: lachlangrose

LoopStructural/modelling/features/fault/_fault_function_feature.py

@@ -1,5 +1,5 @@
 from ....modelling.features import BaseFeature, StructuralFrame
-
+from typing import Optional
 from ....utils import getLogger
 
 logger = getLogger(__name__)
@@ -77,3 +77,6 @@ def evaluate_on_surface(self, location):
         fault_strike = self.fault_frame.features[2].evaluate_value(location)
         d = self.displacement.evaluate(fault_displacement, fault_strike)
         return d
+
+    def get_data(self, value_map: Optional[dict] = None):
+        pass