exit with error when --batch arg is empty string

rather than silently ignoring --batch and entering the REPL.  We must
use a None test rather than a general truthiness test.

Author: rolandwalker

changelog.md

@@ -17,6 +17,7 @@ Bug Fixes
 * Make the return value of `FavoriteQueries.list()` a copy.
 * Make multi-line detection and special cases more robust.
 * Run empty `--execute` arguments instead of ignoring the flag.
+* Exit with error when the `--batch` argument is an empty string.
 
 
 Internal

mycli/main.py

@@ -2664,10 +2664,10 @@ def get_password_from_file(password_file: str | None) -> str | None:
     if cli_args.execute is not None:
         sys.exit(main_execute_from_cli(mycli, cli_args))
 
-    if cli_args.batch and cli_args.batch != '-' and cli_args.progress and sys.stderr.isatty():
+    if cli_args.batch is not None and cli_args.batch != '-' and cli_args.progress and sys.stderr.isatty():
         sys.exit(main_batch_with_progress_bar(mycli, cli_args))
 
-    if cli_args.batch:
+    if cli_args.batch is not None:
         sys.exit(main_batch_without_progress_bar(mycli, cli_args))
 
     if not sys.stdin.isatty():

mycli/main_modes/batch.py

@@ -62,7 +62,7 @@ def dispatch_batch_statements(
 
 def main_batch_with_progress_bar(mycli: 'MyCli', cli_args: 'CliArgs') -> int:
     goal_statements = 0
-    if not cli_args.batch:
+    if cli_args.batch is None:
         return 1
     if not sys.stdin.isatty() and cli_args.batch != '-':
         click.secho('Ignoring STDIN since --batch was also given.', err=True, fg='yellow')
@@ -108,7 +108,7 @@ def main_batch_with_progress_bar(mycli: 'MyCli', cli_args: 'CliArgs') -> int:
 
 
 def main_batch_without_progress_bar(mycli: 'MyCli', cli_args: 'CliArgs') -> int:
-    if not cli_args.batch:
+    if cli_args.batch is None:
         return 1
     if not sys.stdin.isatty() and cli_args.batch != '-':
         click.secho('Ignoring STDIN since --batch was also given.', err=True, fg='red')