Reroute blank /structures/<id> query to /structures

[ml-evs]

Super minor. Closes #128.

[codecov]

Codecov Report

Merging #132 into master will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #132   +/-   ##
=======================================
  Coverage   85.76%   85.77%           
=======================================
  Files          39       39           
  Lines        1834     1835    +1     
=======================================
+ Hits         1573     1574    +1     
  Misses        261      261           

Flag	Coverage Δ
#unittests	85.77% <100.00%> (+<0.01%)	⬆️

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[ml-evs]

Hmmm, this generates a load of undesirable OpenAPI stuff atm, will investigate another way

[CasperWA]

Maybe this can be helpful?

[ml-evs]

I'm going to close this as it doesn't seem to be an easy/wortwhile thing to do.