[datafeed] Set headers parameter to an empty dict in DataFeedParser.retrieve_url This parameter is then passed to urllib2.Request, which expects a dict and won't check for None. Closes #4842333.

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#!/bin/sh -e

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if [ "$1" = "purge" ] ; then

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        update-rc.d cubicweb remove >/dev/null

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fi

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#DEBHELPER#

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exit 0