Avoid uninitialized value error in TAP tests' Cluster->psql

If the method is called in scalar context and we didn't pass in a stderr
handle, one won't be created. However, some error paths assume that it
exists, so in this case create a dummy stderr to avoid the resulting
perl error.

Per gripe from Oleg Tselebrovskiy <[email protected]> and
adapted from his patch.

Discussion: https://postgr.es/m/[email protected]

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