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Re: [sup-devel] Mysterious nil errors

Excerpts from Edward Z. Yang's message of 2010-03-09 23:50:23 -0500:
> -        content_type = (m.header.content_type || "application/unknown").downcase # sometimes RubyMail gives us nil
> +        content_type = (m.header["content_type"] && m.header.content_type || "application/unknown").downcase # sometimes RubyMail gives us nil

Could you explain why these changes help? What's the return value of the
[] call versus the method call?
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