Show "all" opds feed entries only if there is at least one entry
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@ -502,7 +502,7 @@ def render_element_index(database_column, linked_table, folder):
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entries = entries.join(linked_table).join(db.Books)
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entries = entries.filter(calibre_db.common_filters()).group_by(func.upper(func.substr(database_column, 1, 1))).all()
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elements = []
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if off == 0:
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if off == 0 and entries:
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elements.append({'id': "00", 'name': _("All")})
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shift = 1
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for entry in entries[
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