Patch to fix StaticNetworkComposite issue

[ablaom]

Closes #930

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.03% 🎉

Comparison is base (e63cb6c) 87.78% compared to head (de2d527) 87.81%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #931      +/-   ##
==========================================
+ Coverage   87.78%   87.81%   +0.03%     
==========================================
  Files          40       40              
  Lines        3659     3660       +1     
==========================================
+ Hits         3212     3214       +2     
+ Misses        447      446       -1     

Files Changed	Coverage Δ
src/composition/learning_networks/signatures.jl	100.00% <100.00%> (ø)
src/operations.jl	90.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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