Fix RangeError when no domains are provided. This sets a -1 baseline for Math.max, so we get zero rows when no domains are present.
Fix RangeError when no domains are provided.

This sets a -1 baseline for Math.max, so we get zero rows when no domains are present. Resolves #39
Merge branch 'develop' of git.oicr.on.ca:gps/heliotrope into develop