BEC stops iterating over .ymlv files on error even with -k

[robertoaloi]

Running bitbucket_erlang_client with the -k command line switch shall force the tool to keep running even if it encounters errors (very useful for verification runs).

This works within a single repo, however when processing a .ymlt/.ymlv file-pair, the tool stops after the first repo with errors instead of trying the template with the next value.

Note: this behaviour happens at least when an exception happens in the tool. I'm not sure about warnings breaking the iteration.