Fixed cleaner might not clean user not in connected list and handle if the user socket not exist
Fixed cleaner might not clean user not in connected list and handle if the user socket not exist

xnum/hackmd,aswathyjacob8/newtest,PeterDaveHello/hackmd,Yukaii/hackmd,hackmdio/hackmd,janniklorenz/HackMD,jccrofty30/hackmd,PeterDaveHello/hackmd,jccrofty30/hackmd,aswathyjacob8/newtest,Rory80Hz/hackmd,Yukaii/hackmd,Yukaii/hackmd,Rwing/hackmd,aswathyjacob8/newtest,xnum/hackmd,Rwing/hackmd,ironhack/hackmd,jccrofty30/hackmd,Rory80Hz/hackmd,PeterDaveHello/hackmd,jackycute/HackMD,jackycute/HackMD,jackycute/HackMD,janniklorenz/HackMD,Rwing/hackmd,janniklorenz/HackMD,Rory80Hz/hackmd,hackmdio/hackmd,ironhack/hackmd,xnum/hackmd,ironhack/hackmd,hackmdio/hackmd