SORTKEY / DISTKEY When writing data to redshift using AWS Glue

I've tried using a post-action like this:,

datasink = glueContext.write_dynamic_frame.from_options(
    frame=dyf,
    connection_type="redshift",
    connection_options={
        "redshiftTmpDir": "..",
        "dbtable": "..",
        "connectionName": "..",
        "postactions": "ALTER TABLE <TABLE> ALTER DISTSTYLE KEY DISTKEY <DIST-COLUMN>, ALTER SORTKEY (<SORT-COLUM-A>, <SORT-COLUMN-B>);"
    },
    transformation_ctx="..",
)

but the problem with specifying them for this problem is that everything works fine the first time the table is created. On subsequent runs, the job fails because you cannot specify THE SAME sort / dist key on the table.

So is there a way to suppress or ignore errors from the post-actions?