tests/histedit-helpers.sh

templatefilters: raise ProgrammingError if unencodable type passed to json()

This shouldn't happen for any template data types (though I know it does
because of some templater bugs.) Let's clarify it is a bug.

fixbundle() {
    grep -v 'saving bundle' | grep -v 'saved backup' | \
        grep -v added | grep -v adding | \
        grep -v "unable to find 'e' for patching" | \
        grep -v "e: No such file or directory" | \
    cat
}