WS-179: subtask #6 -- remove argparse namespace dependencies in classes

this should fix broken "unit test workflow" in pipeline

apps/cli/executables/datafetcher/datafetcher/datafetcher.py

@@ -8,7 +8,7 @@ from pathlib import Path
 
 # pylint: disable=C0103, E0402, E0611, R0902, R0903, W0703, W1203
 
-from datafetcher.errors import MissingSettingsException, NoProfileException
+from datafetcher.errors import MissingSettingsException, NoProfileException, FileErrorException
 from datafetcher.project_fetcher import ParallelFetcher
 
 from .locations_report import LocationsReport
@@ -63,9 +63,7 @@ class DataFetcher:
             raise MissingSettingsException("output directory option is missing")
         output_dir = Path(self.output_dir)
         if not output_dir.is_dir() or not path_is_accessible(output_dir):
-            raise MissingSettingsException(
-                f"output location {self.output_dir} inaccessible or not found"
-            )
+            raise FileErrorException(f"output location {self.output_dir} inaccessible or not found")
 
         if args.location_file is not None:
             if args.product_locator is not None: