fix font registration bug introduced in #29248; attempt to register font without directory name was prone to silently fail, leading to mapnik complaining about missing fonts.


git-svn-id: http://svn.openstreetmap.org/applications/utils/tirex@29342 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
Fix last change: modtile_socket can block in the accept() loop

git-svn-id: http://svn.openstreetmap.org/applications/utils/tirex@29343 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4