[FIX] Do not fail with spurious 4th dimension on T1w
[FIX] Do not fail with spurious 4th dimension on T1w

Fixes #660

oesteban/mriqc,poldracklab/mriqc,oesteban/mriqc,poldracklab/mriqc,oesteban/mriqc,poldracklab/mriqc,oesteban/mriqc,poldracklab/mriqc