Make runfcgi fail when database connection is open before fork

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# monkey-patch flup to fail loudly if database connection is open when
# preforked child starts - but ONLY when debug=true, so that we don't
# use monkey-patch on production.
import sys
if 'runfcgi' in sys.argv and 'debug=true' in sys.argv:
    from flup.server.preforkserver import PreforkServer
    def _spawnChild(self, sock):
        from django.db import connection
        if connection.connection is not None:
            raise Exception('''Django database connection is open. This MAY NOT happen.''')
        return self._spawnChild_orig(sock)
    PreforkServer._spawnChild_orig = PreforkServer._spawnChild
    PreforkServer._spawnChild = _spawnChild

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