log the underlying ImportError when bayesian deps fail to import

Swallowing the exception made it impossible to tell which of
jax/numpyro/stan actually failed in CI.

quapy/error.py

@@ -3,7 +3,7 @@
 import numpy as np
 from sklearn.metrics import f1_score
 import quapy as qp
-from functional import AitchisonDistance
+from quapy.functional import AitchisonDistance
 
 
 def from_name(err_name):

quapy/method/_bayesian.py

@@ -35,7 +35,8 @@ try:
     import stan.common
 
     DEPENDENCIES_INSTALLED = True
-except ImportError:
+except ImportError as e:
+    logging.getLogger(__name__).warning(f'Bayesian dependencies failed to import: {e!r}')
     jax = None
     jnp = None
     jrandom = None

quapy/protocol.py

@@ -8,8 +8,6 @@ from contextlib import ExitStack
 from abc import ABCMeta, abstractmethod
 from quapy.data import LabelledCollection
 import quapy.functional as F
-from os.path import exists
-from glob import glob
 from collections.abc import Iterable
 from numbers import Number