fixed some bugs that required reference band to be nonzero

[jacksonloper]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 86.62%. Comparing base (0a42dd6) to head (7463181).

Files	Patch %	Lines
bliss/encoder/encoder.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1000   +/-   ##
=======================================
  Coverage   86.62%   86.62%           
=======================================
  Files          23       23           
  Lines        3042     3042           
=======================================
  Hits         2635     2635           
  Misses        407      407           

Flag	Coverage Δ
unittests	86.62% <85.71%> (ø)

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[jeff-regier]

Thanks