convert exit always with exit status zero

[anthony]

Convert should return an exit of 0 whcih in UNIX terms means success
when no error occured.

It should only return a exit of 1 for major errors.

For example a -crop of an image that missed the image will report that it missed as a warning, but this is NOT an error, so convert should still return a
exit of 0.

ASIDE: You command should not be using

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&& echo $? || echo $?

If you want it to always report the error status use

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; echo $?

Of course for Csh or Tcsh that should be

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; echo $status

.