[python-package] remove unnecessary layer of try-catching in conditio…

…nal imports

python-package/lightgbm/__init__.py

@@ -10,21 +10,10 @@
 # and its dependencies as early as possible
 from .basic import Booster, Dataset, Sequence, register_logger
 from .callback import EarlyStopException, early_stopping, log_evaluation, record_evaluation, reset_parameter
+from .dask import DaskLGBMClassifier, DaskLGBMRanker, DaskLGBMRegressor
 from .engine import CVBooster, cv, train
-
-try:
-    from .sklearn import LGBMClassifier, LGBMModel, LGBMRanker, LGBMRegressor
-except ImportError:
-    pass
-try:
-    from .plotting import create_tree_digraph, plot_importance, plot_metric, plot_split_value_histogram, plot_tree
-except ImportError:
-    pass
-try:
-    from .dask import DaskLGBMClassifier, DaskLGBMRanker, DaskLGBMRegressor
-except ImportError:
-    pass
-
+from .plotting import create_tree_digraph, plot_importance, plot_metric, plot_split_value_histogram, plot_tree
+from .sklearn import LGBMClassifier, LGBMModel, LGBMRanker, LGBMRegressor
 
 _version_path = Path(__file__).absolute().parent / "VERSION.txt"
 if _version_path.is_file():