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# awk '/{}$/{print}{printf "%s ",$0;}'

first execute [1.LINE]
/{}$/ [ you can think there is a `if` ] the pattern matched successfully then print (with default ORS="\n")
result --> NULL (because...

try like this
# awk '/{}$/{print;next}{printf "%s",$0;}' file

and 2.solution
# awk -vFx='{}' '{if(substr($0,length-1,length)!=Fx)a=a $0;else {a=a $0;print a;a=""}}' file

regards
ygemici