Properly check existence of a connection type.
Substituting "/dev/null/nonexistent" for an empty $Connection,
of course, does generally work, but is somewhat ugly (esp. in that
the string is appended to $CONN_DIR, so the resulting path may
theoretically exist).
Instead, substitute an empty string for the complete path if $Connection
is empty: an empty string can never be readable.
Signed-off-by:
Ivan Shapovalov <intelfx100@gmail.com>
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