The modules/management/kubectl-apply/kubectl module failed to install the MPI Operator when the source https://raw.githubusercontent.com/kubeflow/mpi-operator/v0.6.0/deploy/v2beta1/mpi-operator.yaml was passed under apply_manifests setting of the module.
This was because of the comments present at the beginning of the mpi-operator.yaml file.

This PR fixes the bug by updating the logic to check malformed documents (like comment blocks) which cause yamldecode() to fail.

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