[IMP] account_statement_import_online: don't import empty statements.

account_statement_import_online/static/description/index.html

@@ -406,6 +406,9 @@ section</li>
 <li>Save the bank account</li>
 <li>Click on provider and configure provider-specific settings.</li>
 </ol>
+<p>If you want to allow empty bank statements to be created every time the
+information is pulled, you can check the option “Allow empty statements”
+at the provider configuration level.</p>
 <p><strong>NOTE</strong>: To access these features, user needs to belong to
 <em>Show Full Accounting Features</em> group.</p>
 </div>