In some cases [1] <series>-eol tag exists but it is not on the last
patch of a branch and we still need to delete them. Originally the
script skips these cases and doesn't allow to delete the branch. This
patch makes it possible to delete the branch anyway (only when the tag
exists!).
[1] for example when:
* patches were merged after EOL tagging
* branch was accidently recreated with new patches
Change-Id: If9491ddb292e2eebcc4c713140ce02c2d89c80a3
2483ee6b7d