utils: checkstyle.py: Treat Malformed trailers as a CommitIssue

If a Malformed trailer is identified the checkstyle script triggers a
RuntimeError and stops processing the rest of the commit.

A malformed trailer can be regarded as an issue in the commit and
reported as such using the same method as other faults identified by the
tool.

Convert the RuntimeError into a CommitIssue and continue processing
other trailers.

Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Tested-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

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