Ok, something odd to report. I took out Troop_38.png since it didn't have a associated shipImage family. Started up the game, changed themes and then back to DW:Extended just in case that would "re-load" the mod, and it still plays fine.
I also figured out why, the old fashioned way. I took out a piece of paper and wrote down all 38 races then looking in the races.txt for each one to see which race was calling for the troop.png with no shipImage family. unluckily for me I started this with the Zenox and worked my way up from the bottom. About half way through I decided to click the Ackdarians and work down when I saw they called for FamilyIndex 0. I immediately realized I started my numbering at 1, not 0, and with 38 races starting a number count with 0 included only calls for 37 image families which also applies to troop.png's . Troop_38.png is never called for by any of the race or policy files.
I imagine pulling one out that is called for would definitely crash the game though :)
What do I see? I see time as it affects all things. Human flesh whithers and dies before my eyes. Flowers bloom, only to fade. Trees drop green leaves, never to regain them. In my sight, it is always winter, always night. ~ Raistlin Majere