text input that could be read as NA/None is now read as a string

Author: spencerthomas1722

src/cnlpt/cnlp_processors.py

@@ -167,7 +167,7 @@ def __init__(self, data_dir: str, tasks: set[str] = None, max_train_items=-1):
             else:
                 sep = "\t"
 
-            self.dataset = load_dataset("csv", sep=sep, data_files=data_files)
+            self.dataset = load_dataset("csv", sep=sep, data_files=data_files, keep_default_na=False)
 
             ## find out what tasks are available to this dataset, and see the overlap with what the
             ## user specified at the cli, remove those tasks so we don't also get them from other datasets