Fix missing conditional in `create_partitions` (#89)
Fix missing conditional in `create_partitions` (#89)

```./setup_sdcard.sh: line 647: syntax error near unexpected token `fi'``` is generated unless missing `then` is added back in.
beagleboard/image-builder,robert-budde/omap-image-builder,jadonk/image-builder,RobertCNelson/omap-image-builder,RobertCNelson/omap-image-builder,miloh/image-builder,jadonk/image-builder,beagleboard/image-builder,miloh/image-builder,robert-budde/omap-image-builder