Genomes 'show' function

The show function in genomes returns an internal server error when called through a GET rest request to the URL /api/genomes/{genome_id}, 
Where if a genome object is:
[

```
"orang/human Jun. 2008 (UCSC Recon/homIni20) (homIni20)",
"homIni20"
```

]
 homIni20 should be the genome id 
