Fix for handling IfThenElse node with undefined else clause.
Fix for handling IfThenElse node with undefined else clause.

kenkuang1213/Halide,rodrigob/Halide,tdenniston/Halide,fengzhyuan/Halide,jiawen/Halide,delcypher/Halide,kenkuang1213/Halide,fengzhyuan/Halide,mcanthony/Halide,smxlong/Halide,ayanazmat/Halide,dougkwan/Halide,dan-tull/Halide,kenkuang1213/Halide,kgnk/Halide,tdenniston/Halide,kenkuang1213/Halide,dan-tull/Halide,ronen/Halide,kgnk/Halide,aam/Halide,rodrigob/Halide,dan-tull/Halide,gchauras/Halide,smxlong/Halide,aam/Halide,kgnk/Halide,delcypher/Halide,rodrigob/Halide,dougkwan/Halide,smxlong/Halide,psuriana/Halide,kgnk/Halide,dan-tull/Halide,jiawen/Halide,ronen/Halide,dan-tull/Halide,dougkwan/Halide,lglucin/Halide,ayanazmat/Halide,ronen/Halide,tdenniston/Halide,rodrigob/Halide,psuriana/Halide,mcanthony/Halide,jiawen/Halide,myrtleTree33/Halide,damienfir/Halide,fengzhyuan/Halide,myrtleTree33/Halide,lglucin/Halide,ronen/Halide,kgnk/Halide,mcanthony/Halide,lglucin/Halide,delcypher/Halide,rodrigob/Halide,delcypher/Halide,kgnk/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,damienfir/Halide,delcypher/Halide,kenkuang1213/Halide,adasworks/Halide,lglucin/Halide,rodrigob/Halide,psuriana/Halide,tdenniston/Halide,smxlong/Halide,mcanthony/Halide,adasworks/Halide,adasworks/Halide,gchauras/Halide,myrtleTree33/Halide,damienfir/Halide,myrtleTree33/Halide,myrtleTree33/Halide,ayanazmat/Halide,dan-tull/Halide,kgnk/Halide,aam/Halide,delcypher/Halide,adasworks/Halide,rodrigob/Halide,kenkuang1213/Halide,adasworks/Halide,damienfir/Halide,mcanthony/Halide,fengzhyuan/Halide,dougkwan/Halide,dan-tull/Halide,psuriana/Halide,kenkuang1213/Halide,damienfir/Halide,damienfir/Halide,fengzhyuan/Halide,damienfir/Halide,mcanthony/Halide,psuriana/Halide,dougkwan/Halide,adasworks/Halide,mcanthony/Halide,gchauras/Halide,smxlong/Halide,kenkuang1213/Halide,fengzhyuan/Halide,dougkwan/Halide,ayanazmat/Halide,lglucin/Halide,delcypher/Halide,jiawen/Halide,adasworks/Halide,aam/Halide,tdenniston/Halide,jiawen/Halide,gchauras/Halide,fengzhyuan/Halide,tdenniston/Halide,tdenniston/Halide,smxlong/Halide,myrtleTree33/Halide,ronen/Halide,delcypher/Halide,smxlong/Halide,damienfir/Halide,myrtleTree33/Halide,aam/Halide,ronen/Halide,ayanazmat/Halide,dougkwan/Halide,aam/Halide,ayanazmat/Halide,lglucin/Halide,gchauras/Halide,adasworks/Halide,ayanazmat/Halide,smxlong/Halide,rodrigob/Halide,dougkwan/Halide,dan-tull/Halide,gchauras/Halide,mcanthony/Halide,tdenniston/Halide,ayanazmat/Halide,lglucin/Halide,psuriana/Halide,ronen/Halide,aam/Halide,myrtleTree33/Halide,fengzhyuan/Halide,jiawen/Halide,jiawen/Halide