fix: change surfe import behaviour warning

Author: Lachlan Grose

LoopStructural/interpolators/__init__.py

@@ -83,7 +83,16 @@ class InterpolatorType(IntEnum):
 try:
     from ..interpolators._surfe_wrapper import SurfeRBFInterpolator
 except ImportError:
-    SurfeRBFInterpolator = None
+    class SurfeRBFInterpolator(GeologicalInterpolator):
+        """
+        Dummy class to handle the case where Surfe is not installed.
+        This will raise a warning when used.
+        """
+
+        def __init__(self, *args, **kwargs):
+            raise ImportError(
+                "Surfe cannot be imported. Please install Surfe. pip install surfe/ conda install -c loop3d surfe"
+            ) 
 interpolator_map = {
     InterpolatorType.BASE: GeologicalInterpolator,
     InterpolatorType.BASE_DISCRETE: DiscreteInterpolator,

LoopStructural/interpolators/_interpolator_factory.py

@@ -39,8 +39,6 @@ def create_interpolator(
                 element_volume=element_volume,
                 buffer=buffer,
             )
-        if interpolator_map.get(interpolatortype) is None:
-            raise ValueError(f"Interpolator type {interpolatortype} is not supported or available, please choose another interpolator type.")
         return interpolator_map[interpolatortype](support)
 
     @staticmethod