Raise exception on wrong off-target format. Fix #7

crisprbact/__init__.py

@@ -4,10 +4,12 @@ from crisprbact.off_target import (
     extract_features,
     extract_records,
 )
+from crisprbact.utils import NoRecordsException
 
 __all__ = [
     "extract_records",
     "on_target_predict",
     "compute_off_target_df",
     "extract_features",
+    "NoRecordsException",
 ]