fix: add get data

Author: lachlangrose

LoopStructural/modelling/features/fault/_fault_function_feature.py

@@ -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):
+        pass