Fix logic

Author: domfournier

simpeg_drivers/components/factories/directives_factory.py

@@ -489,7 +489,10 @@ def assemble_keyword_arguments(
         name=None,
     ):
         receivers = inversion_object.entity
-        channels = [float(val) for val in getattr(receivers, "channels", [None]) if val]
+        channels = [
+            float(val) if val else None
+            for val in getattr(receivers, "channels", [None])
+        ]
         components = list(inversion_object.observed)
         ordering = inversion_object.survey.ordering
         n_locations = len(np.unique(ordering[:, 2]))