Fixed HostPortWaitStrategy throws NumberFormatException when port is exposed but not mapped

[barrycommins]

Ports that were exposed but not mapped to a host port were throwing NumberFormatException when getMappedPort() was called on ContainerState.

E.g.

redis:
  image: redis
  ports:
    - 6379

[bsideup]

could you please convert it to try-with-resources-style and maybe just add to some other Docker Compose test

[barrycommins]

@bsideup

Updated as suggested. I just added an exposed port to one of the existing test docker-compose files, which causes several existing tests to fail without the fix, but pass with the fix.

[bsideup]

@barrycommins merged, thanks! 👍

[ilkinulas]

Are there any plans to release 1.7.1?

[bsideup]

@ilkinulas yes, we will do a hotfix release later this week :)