Make sure cancel_func is not None
Related: rhbz#1656691
(cherry picked from commit ca2c3d9e77
)
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@ -663,7 +663,7 @@ def run_creator(opts, cancel_func=None):
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log.error("squashfs.img creation failed")
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raise RuntimeError("squashfs.img creation failed")
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if cancel_func():
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if cancel_func and cancel_func():
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raise RuntimeError("ISO creation canceled")
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with Mount(disk_img, opts="loop") as mount_dir:
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