skip reactions without subs and prods

[paulflang]

No description provided.

[codecov]

Codecov Report

Merging #25 (9f3e077) into main (5005264) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #25      +/-   ##
==========================================
+ Coverage   84.96%   85.16%   +0.19%     
==========================================
  Files           1        1              
  Lines         153      155       +2     
==========================================
+ Hits          130      132       +2     
  Misses         23       23              

Impacted Files	Coverage Δ
src/reactionsystem.jl	85.16% <100.00%> (+0.19%)	⬆️

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[anandijain]

is there a test-suite case that this fixes? not exactly sure where this is needed. I'm sure it is though

[paulflang]

yeah. it is case 01246.