Add pre-condition check for completeness.
Add pre-condition check for completeness.

JeremybellEU/polymer,ikeagold/polymer,MartinMoizard/polymer,ktiedt/polymer,yforrest/polymer,gronke/polymer,exlerdesigns/polymer,MartinsThiago/polymer,MartinMoizard/polymer,jordanyaker/polymer,Polymer/polymer,tjsavage/polymer,exlerdesigns/polymer,Endika/polymer,Endika/polymer,yforrest/polymer,tjsavage/polymer,mgiuffrida/polymer,tjsavage/polymer,Polymer/polymer,Endika/polymer,mgiuffrida/polymer,jordanyaker/polymer,ikeagold/polymer,yforrest/polymer,JeremybellEU/polymer,mgiuffrida/polymer,gronke/polymer,gazal-k/polymer,exlerdesigns/polymer,gronke/polymer,Polymer/polymer,MartinMoizard/polymer,JeremybellEU/polymer,jordanyaker/polymer,ktiedt/polymer,gazal-k/polymer,MartinsThiago/polymer,ikeagold/polymer,MartinsThiago/polymer,gazal-k/polymer,ktiedt/polymer