fix: ignore first row of HTML table when is contains only a single column

packages/back-office/src/scripts/generate_echeanciers_json.ts

@@ -1003,11 +1003,17 @@ async function normalizeEcheancier(
     } else {
       // 2024 and later syntax
       let skipNumeroOrdreColumn = false
+      let expectingLabels = true
       for (const [trIndex, trElement] of document
         .querySelectorAll("table tbody tr")
         .entries()) {
         const tdElements = [...trElement.querySelectorAll("td")]
-        if (trIndex === 0) {
+        if (expectingLabels) {
+          if (tdElements.length === 1) {
+            // The row contains a title of the table. Ignore it.
+            // See for example:
+            // https://www.legifrance.gouv.fr/dossierlegislatif/JORFDOLE000050427907/?detailType=CONTENU&detailId=1
+          } else {
             const texts = tdElements.map((tdElement) =>
               tdElement?.textContent?.trim(),
             )
@@ -1025,6 +1031,8 @@ async function normalizeEcheancier(
                 `Dans le dossier ${dossier.META.META_COMMUN.ID}, les entêtes de l'échéancier (${texts.join(", ")}) ne correspondent pas à ceux attendus`,
               )
             }
+            expectingLabels = false
+          }
         } else if (tdElements.length <= 2) {
           // This is a followup line: same article but different decret.
           const { ARTICLE, BASE_LEGALE, OBJET } = lignes.at(