Bug#928349: shellcheck: dubious diagnostics SC2188

[Dmitry Bogatov]

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Package: shellcheck
Version: 0.5.0-3
Severity: normal

Dear Maintainer,

shellcheck complains on empty redirection:

        $ cat /tmp/foo.sh
        #!/bin/sh
        > /tmp/foo
        $ shellcheck /tmp/foo.sh

        > /tmp/foo
        ^-- SC2188: This redirection doesn't have a command. Move to its 
command (=
or use 'true' as no-op).

As discussed in #923478, empty redirection is posix-complaint, more
concise way to say "true > /tmp/foo": create file if it does not exist
and make sure it have zero size. Futhermore, shellcheck complains on
such construction in bash mode, where it definitely works as intended.

I think this diagnostics is incorrect.
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