[yocto] [PATCH] fetch2/__init_.py removed bb.error which caused exit code 1

[Paulo Neves]

http://lists.openembedded.org/pipermail/openembedded-core/2012-September/069448.html

Workaround to avoid exit 1 status.

    The reason it happens is that there are 2 missions
    the state cache uses the normal fetcher to get
    its's stuff and it is acceptable for it to fail.
    On the other hand it is not acceptable for fetch
    to fail.

    In it's code the state cache code catches the exception that the
    fetcher launches and discards. The problem
    is that before this exception is caught it prints
    a bb.error and bb.error prints something and
    continues on like no problem happened.  but marks
    the exit code as 1 which is a disaster.
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