FIX: Multiple T2ws, coerce reference to string

[mgxd]

Fixes #332

Tests pending

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (7c8f110) 32.83% compared to head (b63301d) 32.83%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
nibabies/workflows/anatomical/template.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #333   +/-   ##
=======================================
  Coverage   32.83%   32.83%           
=======================================
  Files          55       55           
  Lines        5299     5299           
=======================================
  Hits         1740     1740           
  Misses       3559     3559           

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