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fix ValueError: max() arg is an empty sequence #1

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fix ValueError: max() arg is an empty sequence #1

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2 changes: 1 addition & 1 deletion src/tox/session/commands/show_env.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ def show_envs(config, all_envs=False, description=False):

if description and default:
report.line("default environments:")
max_length = max(len(env) for env in (default + extra))
max_length = max(len(env) for env in (default + extra) or [''])

def report_env(e):
if description:
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