makes orsopy actually optional

Author: alexhroom

RATapi/__init__.py

@@ -1,11 +1,16 @@
 """RATapi is a Python package for modelling, fitting and optimising reflectivity problems."""
 
+from contextlib import suppress
+
 import RATapi.examples as examples
 from RATapi import events, models
 from RATapi.classlist import ClassList
 from RATapi.controls import Controls
 from RATapi.project import Project
 from RATapi.run import run
-from RATapi.utils import convert, orso, plotting
+from RATapi.utils import convert, plotting
+
+with suppress(ImportError):  # orsopy is an optional dependency
+    from RATapi.utils import orso as orso
 
-__all__ = ["examples", "models", "events", "ClassList", "Controls", "Project", "run", "plotting", "convert", "orso"]
+__all__ = ["examples", "models", "events", "ClassList", "Controls", "Project", "run", "plotting", "convert"]