Fix to handle if user avatar photo is null
Fix to handle if user avatar photo is null

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