added sections to recover from additional kinds of errors such as HC output bams being deleted from tmp disk, or n_available_samples being < n_expected_samples due to transient errors
added sections to recover from additional kinds of errors such as HC output bams being deleted from tmp disk, or n_available_samples being < n_expected_samples due to transient errors

macarthur-lab/exac_readviz_scripts,macarthur-lab/exac_readviz_scripts