Proper way to reference potentially missing key

Woot4moo <[email protected]>
Newsgroups gmane.comp.security.detection.bro
Message-ID <CALiK30_8D5O-Q7LcqjFQ-yk0HL_hUgFRmcJBC36S8ukueSS6Fg@mail.gmail.com>
How can one reference a potentially missing key such that the script will
not terminate? For example in a file_new event, if I reference the
mime_type attribute and it is uninitialized I receive “no such field in
record”

Example code below:

  if( f?$mime_type) #error here

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