debug XomicsToModel function

[rosieluo2021]

Debug

I hereby confirm that I have:

• [ X ] Tested my code on my own machine
• [ ] Followed the guidelines in the Contributing Guide
• [ X ] Selected develop as a target branch (top left drop-down menu)

(Note: You may replace [ ] with [X] to check the box)

[rmtfleming]

.gitmodules should not have binary repo removed