log-parse: fix error message when no error lines are found (#10543)
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@ -76,7 +76,7 @@ def make_log_context(log_events, width=None):
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error_lines = set(e.line_no for e in log_events)
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log_events = sorted(log_events, key=lambda e: e.line_no)
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num_width = len(str(max(error_lines))) + 4
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num_width = len(str(max(error_lines or [0]))) + 4
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line_fmt = '%%-%dd%%s' % num_width
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indent = ' ' * (5 + num_width)
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