Skip gone (removed) remote branches

ks132 ks132requested to merge
ks132/meld:skip-gone-remote into main

When running meld . on a Git repository with some local branches with removed remote branches, meld tries to run git rev-list on them. For each removed remote branch the following error message is printed:

fatal: bad revision '^some_branch_name'

This patch skips such branches and no error message like above is printed.

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