Added _import_error_ignored_modules.

ImportErrors on these entity modules will be ignored when dynamically
loading them, since they have optional external dependencies and we
shouldn't throw an error if we can't import them.

platypush/entities/_base.py

@@ -4,7 +4,7 @@ import pathlib
 import types
 from datetime import datetime
 from dateutil.tz import tzutc
-from typing import Callable, Mapping, Type, Tuple, Any
+from typing import Callable, Final, Mapping, Set, Type, Tuple, Any
 
 import pkgutil
 from sqlalchemy import (
@@ -26,6 +26,14 @@ from platypush.message import JSONAble
 
 entities_registry: Mapping[Type['Entity'], Mapping] = {}
 
+_import_error_ignored_modules: Final[Set[str]] = {'bluetooth'}
+"""
+ImportError exceptions will be ignored for these entity submodules when
+imported dynamically. An ImportError for these modules means that some optional
+requirements are missing, and if those plugins aren't enabled then we shouldn't
+fail.
+"""
+
 
 if 'entity' not in Base.metadata:
 
@@ -177,8 +185,15 @@ def _discover_entity_types():
             module = types.ModuleType(mod_loader.name)
             mod_loader.loader.exec_module(module)
         except Exception as e:
+            if (
+                isinstance(e, (ImportError, ModuleNotFoundError))
+                and modname[len(__package__) + 1 :] in _import_error_ignored_modules
+            ):
+                logger.debug(f'Could not import module {modname}')
+            else:
                 logger.warning(f'Could not import module {modname}')
                 logger.exception(e)
+
             continue
 
         for _, obj in inspect.getmembers(module):