handler: ignore progress lines that cannot be parsed
requested to merge topic/1.0.x/handler-ignore-progress-lines-that-cannot-be-parsed into branch/1.0.x
Previously, the code assumes every line that ends with \r is a progress line
that contains a number. This assumption is broken by the response returned by
Azure Repos, which contains an empty line that ends with \r and causes the
extension to crash.
Fixes AttributeError when cloning from Azure Repo (#391 - closed).