Fix spurious error in master log
Fix spurious error in master log

When only GitPython is installed, and no gitfs_provider is set, an error
about pygit2 not being available is logged. This should not happen, as
gitfs should just select the first available out of pygit2, gitpython,
and dulwich.

This fixes #17945 by suppressing the error.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt