jdibug-connect can add nil to list of virtual machines

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What steps will reproduce the problem?
1. Try to connect when there is no listening process
2. It will fail, but jdibug-virtual-machines will be the list(nil)

Here's a simple fix:  instead of using mapcar, use mapcan:

  (mapcan (lambda (connect-host-and-port)
                    (let* (...)
                          (jdibug-message (format "%s:%s" host port) t)
                          (condition-case err
                                  (progn
                                    (jdi-virtual-machine-connect vm)
                                    (jdibug-message "(connected)" t)
                                    (list vm))
                            (file-error (jdibug-message "(failed)" t) nil))))
                  jdibug-connect-hosts))

Original issue reported on code.google.com by lann...@gmail.com on 16 Sep 2010 at 4:45

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Original comment by udalrich.schermer on 5 Dec 2010 at 2:39

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Fixed in r416.  To be released as part of 0.4.

Original comment by udalrich.schermer on 5 Dec 2010 at 2:46

• Changed state: Fixed

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Original comment by udalrich.schermer on 12 Apr 2011 at 3:28

• Changed state: Released