Fix simplification of blocks/ifs when the second if statement does not have an else case.
Fix simplification of blocks/ifs when the second if statement does not have an else case.

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