Added check for return code when checking for bzr.

Review Request #11196 — Created Sept. 21, 2020 and submitted — Latest diff uploaded

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RBTools
master

Reviewers

When pyenv is in use and the needed executable is only available in a
different Python version, pyenv intercepts the call and will print
an error/return 127.

When running bzr help under these conditions, we see this:
pyenv: bzr: command not found

The `bzr' command exists in these Python versions:
2.7.14

Tested 'rbt post' manually in my local integrations repo with the changes.

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