[BUILD] skip bwc version check if directory doesn't exists or is not a directory
[BUILD] skip bwc version check if directory doesn't exists or is not a directory

fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch,fubuki/elasticsearch,aparo/elasticsearch,aparo/elasticsearch