Avoid throwing error if nordnet_api_client is not present

fin_depo/__init__.py

@@ -55,12 +55,20 @@ __all__ = [
     'static',
 ]
 
+import logging
+
 from . import (
     data,
     defi_kraken,
     defi_kucoin,
     defi_partisia_blockchain,
-    investbank_nordnet,
     static,
 )
 from ._version import __version__
+
+logger = logging.getLogger(__name__)
+
+try:
+    from . import investbank_nordnet
+except ImportError:
+    logger.exception('Could not import %s. Are module requirements installed?', 'fin_depo.investbank_nordnet')