remove import test, since part of the package itself

src/openqlab/__init__.py

-from pkg_resources import get_distribution, DistributionNotFound
+from pkg_resources import DistributionNotFound, get_distribution
+
+from openqlab.io.data_container import DataContainer
 
 try:
     # Change here if project is renamed and does not equal the package name
@@ -8,8 +10,3 @@ except DistributionNotFound:
     __version__ = "unknown"
 
 __all__ = ["analysis", "io", "plots", "conversion"]
-
-try:
-    from openqlab.io.data_container import DataContainer
-except ImportError:
-    print("Unable to import DataContainer")