requirements: Remove catboost from required dependencies

Catch all exceptions at import attempt.

Author: ales-erjavec

Orange/classification/__init__.py

@@ -1,5 +1,5 @@
 # Pull members from modules to Orange.classification namespace
-# pylint: disable=wildcard-import
+# pylint: disable=wildcard-import,broad-except
 
 from .base_classification import (ModelClassification as Model,
                                   LearnerClassification as Learner,
@@ -23,7 +23,7 @@
 from .scoringsheet import *
 try:
     from .catgb import *
-except ModuleNotFoundError:
+except Exception:
     pass
 from .gb import *
 try:

Orange/regression/__init__.py

@@ -17,7 +17,7 @@
 from ..classification.simple_tree import *
 try:
     from .catgb import *
-except ModuleNotFoundError:
+except Exception:
     pass
 from .gb import *
 try:

requirements-core.txt

@@ -1,6 +1,5 @@
 baycomp>=1.0.2
 bottleneck>=1.3.4
-catboost>=1.0.1
 # Encoding detection
 chardet>=3.0.2
 httpx>=0.21.0