improve argument and error handling

Author: TimidRobot

scripts/1-fetch/gcs_fetch.py

@@ -82,7 +82,10 @@ def parse_arguments():
         action="store_true",
         help="Development mode: avoid hitting API (generate fake data)",
     )
-    return parser.parse_args()
+    args = parser.parse_args()
+    if not args.enable_save and args.enable_git:
+        parser.error("--enable-git requires --enable-save")
+    return args
 
 
 def get_search_service():
@@ -289,7 +292,8 @@ def main():
             LOGGER.error(e.message)
         sys.exit(e.exit_code)
     except SystemExit as e:
-        LOGGER.error(f"System exit with code: {e.code}")
+        if e.code != 0:
+            LOGGER.error(f"System exit with code: {e.code}")
         sys.exit(e.code)
     except KeyboardInterrupt:
         LOGGER.info("(130) Halted via KeyboardInterrupt.")