Diff not working in dev-master with imagemagick

[danez]

It is working with 0.6.0. old images are also there, so running photobox several times does not fix issue.

Running "photobox:task" (photobox) task

PHOTOBOX STARTED PHOTO SESSION.
started photo session for http://com#1200
started photo session for https://com/login#1200
>> picture of login#1200 taken.
>> picture of http://com#1200 taken.
>> PHOTOBOX FINISHED PHOTO SESSION SUCCESSFULLY.

NOTE: You defined to use ImageMagick, make sure it is installed.

PHOTOBOX STARTED DIFF GENERATION.
started diff for .com#1200
>> Nothing to diff here - no old pictures available.
started diff for com-login#1200
>> Nothing to diff here - no old pictures available.
>> PHOTOBOX FINISHED DIFF GENERATION SUCCESSFULLY.

PHOTOBOX STARTED INDEX FILE GENERATION
>> PHOTOBOX CREATED NEW 'index.html' AT 'data/photobox/'.

Done, without errors.