aa-mergeprof failure if merging profile that doesn't exist in target directory

# head */*
==> new/bin.true <==
# Last Modified: Mon Dec 1 23:21:00 2014
/bin/true {
  /bin/true r,

}

==> old/bin.false <==
/bin/false {
  /bin/false r,
}

# cd new
# aa-mergeprof -d . ../old/bin.false

Merging profile for /bin/false

Profile: /bin/false
Path: /bin/false
Mode: r
Severity: unknown

 [1 - /bin/false]
[(A)llow] / (D)eny / (I)gnore / (G)lob / Glob with (E)xtension / (N)ew / Abo(r)t / (F)inish / (M)ore
Adding /bin/false r to profile

= Changed Local Profiles =

The following local profiles were changed. Would you like to save them?

 [1 - /bin/false]
(S)ave Changes / [(V)iew Changes] / Abo(r)t / (I)gnore

Now we have even two ways to fail:

a) (S)ave Changes will write an empty bin.false file

b) (V)iew Changes will crash with an obvious reason:

Traceback (most recent call last):
  File "/home/cb/apparmor/HEAD-clean/utils/aa-mergeprof", line 795, in <module>
    main()
  File "/home/cb/apparmor/HEAD-clean/utils/aa-mergeprof", line 113, in main
    act([user_file, base_file, None], 2, profile_name)
  File "/home/cb/apparmor/HEAD-clean/utils/aa-mergeprof", line 157, in act
    apparmor.aa.display_changes_with_comments(mergeprofiles.user.filename, newprofile)
  File "/home/cb/apparmor/HEAD-clean/utils/apparmor/aa.py", line 2437, in display_changes_with_comments
    raise AppArmorException(_("Can't find existing profile %s to compare changes.") % oldprofile)
apparmor.common.AppArmorException: "Can't find existing profile /home/cb/apparmor/HEAD-clean/profiles/server-profile/logprof-crash-logger/new/bin.false to compare changes."