if not enabled, set content_preview to "" instead of null
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@ -231,7 +231,7 @@ class Feeds extends Handler_Protected {
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++$headlines_count;
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if (!get_pref('SHOW_CONTENT_PREVIEW')) {
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$line["content_preview"] = null;
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$line["content_preview"] = "";
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} else {
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$line["content_preview"] = "— " . truncate_string(strip_tags($line["content"]), 250);
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