remove empty lines

[satra]

this addresses the issue of generating empty continuation lines seen in the afni recipe.

[codecov]

Codecov Report

Base: 83.74% // Head: 83.67% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (69fa8a0) compared to base (f79ef3e).
Patch coverage: 50.00% of modified lines in pull request are covered.

❗ Current head 69fa8a0 differs from pull request most recent head 963e6fc. Consider uploading reports for the commit 963e6fc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #488      +/-   ##
==========================================
- Coverage   83.74%   83.67%   -0.07%     
==========================================
  Files          11       11              
  Lines        1015     1017       +2     
==========================================
+ Hits          850      851       +1     
- Misses        165      166       +1     

Impacted Files	Coverage Δ
neurodocker/reproenv/renderers.py	93.20% <50.00%> (-0.22%)	⬇️

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