style: Use the hashmap indexed getter in the custom props iterator code.
style: Use the hashmap indexed getter in the custom props iterator code.

This will give a nicer error message, plus it's more compact.

dati91/servo,DominoTree/servo,mbrubeck/servo,cbrewster/servo,DominoTree/servo,splav/servo,larsbergstrom/servo,peterjoel/servo,jimberlage/servo,SimonSapin/servo,eddyb/servo,CJ8664/servo,paulrouget/servo,splav/servo,mattnenterprise/servo,upsuper/servo,eddyb/servo,DominoTree/servo,paulrouget/servo,KiChjang/servo,cbrewster/servo,dsandeephegde/servo,peterjoel/servo,nnethercote/servo,pyfisch/servo,KiChjang/servo,nnethercote/servo,saneyuki/servo,upsuper/servo,KiChjang/servo,splav/servo,larsbergstrom/servo,SimonSapin/servo,larsbergstrom/servo,DominoTree/servo,paulrouget/servo,dsandeephegde/servo,pyfisch/servo,szeged/servo,paulrouget/servo,SimonSapin/servo,eddyb/servo,avadacatavra/servo,sadmansk/servo,notriddle/servo,emilio/servo,SimonSapin/servo,notriddle/servo,splav/servo,ConnorGBrewster/servo,rnestler/servo,jimberlage/servo,larsbergstrom/servo,peterjoel/servo,saneyuki/servo,notriddle/servo,SimonSapin/servo,paulrouget/servo,mbrubeck/servo,saneyuki/servo,anthgur/servo,mattnenterprise/servo,dati91/servo,fiji-flo/servo,fiji-flo/servo,nnethercote/servo,dati91/servo,saneyuki/servo,avadacatavra/servo,canaltinova/servo,mbrubeck/servo,avadacatavra/servo,anthgur/servo,SimonSapin/servo,splav/servo,sadmansk/servo,thiagopnts/servo,paulrouget/servo,splav/servo,mbrubeck/servo,paulrouget/servo,saneyuki/servo,notriddle/servo,KiChjang/servo,fiji-flo/servo,peterjoel/servo,nnethercote/servo,canaltinova/servo,anthgur/servo,DominoTree/servo,jimberlage/servo,mbrubeck/servo,splav/servo,notriddle/servo,pyfisch/servo,dsandeephegde/servo,ConnorGBrewster/servo,sadmansk/servo,mbrubeck/servo,szeged/servo,dsandeephegde/servo,dati91/servo,saneyuki/servo,CJ8664/servo,anthgur/servo,canaltinova/servo,cbrewster/servo,anthgur/servo,SimonSapin/servo,rnestler/servo,KiChjang/servo,rnestler/servo,larsbergstrom/servo,sadmansk/servo,eddyb/servo,thiagopnts/servo,szeged/servo,ConnorGBrewster/servo,dati91/servo,peterjoel/servo,paulrouget/servo,thiagopnts/servo,upsuper/servo,sadmansk/servo,szeged/servo,saneyuki/servo,cbrewster/servo,avadacatavra/servo,DominoTree/servo,dati91/servo,peterjoel/servo,nnethercote/servo,sadmansk/servo,nnethercote/servo,cbrewster/servo,KiChjang/servo,nnethercote/servo,saneyuki/servo,CJ8664/servo,fiji-flo/servo,saneyuki/servo,pyfisch/servo,avadacatavra/servo,sadmansk/servo,KiChjang/servo,emilio/servo,emilio/servo,canaltinova/servo,larsbergstrom/servo,splav/servo,dati91/servo,thiagopnts/servo,fiji-flo/servo,avadacatavra/servo,thiagopnts/servo,rnestler/servo,nnethercote/servo,thiagopnts/servo,dsandeephegde/servo,rnestler/servo,mattnenterprise/servo,rnestler/servo,dati91/servo,jimberlage/servo,emilio/servo,larsbergstrom/servo,KiChjang/servo,fiji-flo/servo,pyfisch/servo,fiji-flo/servo,cbrewster/servo,notriddle/servo,emilio/servo,nnethercote/servo,jimberlage/servo,avadacatavra/servo,nnethercote/servo,upsuper/servo,mbrubeck/servo,DominoTree/servo,eddyb/servo,jimberlage/servo,upsuper/servo,jimberlage/servo,avadacatavra/servo,jimberlage/servo,mattnenterprise/servo,eddyb/servo,splav/servo,canaltinova/servo,larsbergstrom/servo,larsbergstrom/servo,paulrouget/servo,splav/servo,pyfisch/servo,emilio/servo,DominoTree/servo,dsandeephegde/servo,szeged/servo,ConnorGBrewster/servo,mattnenterprise/servo,pyfisch/servo,peterjoel/servo,CJ8664/servo,rnestler/servo,notriddle/servo,emilio/servo,CJ8664/servo,cbrewster/servo,peterjoel/servo,notriddle/servo,notriddle/servo,rnestler/servo,dsandeephegde/servo,ConnorGBrewster/servo,dsandeephegde/servo,DominoTree/servo,thiagopnts/servo,pyfisch/servo,szeged/servo,anthgur/servo,szeged/servo,peterjoel/servo,upsuper/servo,paulrouget/servo,upsuper/servo,ConnorGBrewster/servo,emilio/servo,KiChjang/servo,fiji-flo/servo,szeged/servo,cbrewster/servo,emilio/servo,canaltinova/servo,notriddle/servo,szeged/servo,upsuper/servo,mbrubeck/servo,pyfisch/servo,KiChjang/servo,larsbergstrom/servo,mattnenterprise/servo,eddyb/servo,thiagopnts/servo,CJ8664/servo,mattnenterprise/servo,CJ8664/servo,szeged/servo,canaltinova/servo,anthgur/servo,ConnorGBrewster/servo,anthgur/servo,DominoTree/servo,saneyuki/servo,ConnorGBrewster/servo,pyfisch/servo,mattnenterprise/servo,peterjoel/servo,sadmansk/servo,jimberlage/servo,CJ8664/servo,emilio/servo,eddyb/servo,SimonSapin/servo,canaltinova/servo