Commit 5b4cdf13 authored by Committed by Vincent A
[weboob/browser/elements] Implement the empty_xpath attribute
The empty_xpath attribute is used to fetch an explicit message on a page when there is no account, no transaction or no investment for example. The goal of this attribute is to avoid silent bugs when an item page has completely changed and the item_xpath does not match any element anymore: in these cases we don't scrape any element but we don't crash either ; whereas if empty_xpath is defined at least we will have a warning that the page may have changed.
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