[FIX] l10n_fr_fec: EcritureLib should not be empty

Make an account move with two move lines.
In those lines' label, just hit the space bar, and post your entry.

Now, get the FEC report.

Before this commit, the EcritureLib field was empty

After, it has the value '/'

closes #24734

addons/l10n_fr_fec/wizard/fec.py

@@ -288,7 +288,9 @@ class AccountFrFec(models.TransientModel):
             END
             AS PieceRef,
             TO_CHAR(am.date, 'YYYYMMDD') AS PieceDate,
-            CASE WHEN aml.name IS NULL THEN '/' ELSE replace(aml.name, '|', '/') END AS EcritureLib,
+            CASE WHEN aml.name IS NULL THEN '/'
+                WHEN aml.name SIMILAR TO '[\t|\s|\n]*' THEN '/'
+                ELSE replace(aml.name, '|', '/') END AS EcritureLib,
             replace(CASE WHEN aml.debit = 0 THEN '0,00' ELSE to_char(aml.debit, '000000000000000D99') END, '.', ',') AS Debit,
             replace(CASE WHEN aml.credit = 0 THEN '0,00' ELSE to_char(aml.credit, '000000000000000D99') END, '.', ',') AS Credit,
             CASE WHEN rec.name IS NULL THEN '' ELSE rec.name END AS EcritureLet,