[BUG] Fix Sklearn Models detection by safely importing openml-sklearn

openml/runs/__init__.py

@@ -1,5 +1,7 @@
 # License: BSD 3-Clause
 
+import importlib.util
+
 from .functions import (
     delete_run,
     get_run,
@@ -15,6 +17,9 @@
 from .run import OpenMLRun
 from .trace import OpenMLRunTrace, OpenMLTraceIteration
 
+if importlib.util.find_spec("openml_sklearn"):
+    import openml_sklearn  # noqa: F401
+
 __all__ = [
     "OpenMLRun",
     "OpenMLRunTrace",