feat: harden against empty jira

modules/interfaces/interfaceTicketObjects.py

@@ -509,7 +509,28 @@ class TicketSharepointSyncInterface:
     def _create_csv_content(self, data: list[dict]) -> bytes:
         """Create CSV content with 4-row structure matching reference code."""
         if not data:
-            return b""
+            # Build an empty table with the expected columns from schema
+            cols = list(self.task_sync_definition.keys())
+
+            df = pd.DataFrame(columns=cols)
+
+            # Row 1 & 2: keep your current banner lines
+            header_row1 = pd.DataFrame(
+                [["Header 1"] + [""] * (len(cols) - 1)], columns=cols
+            )
+            header_row2 = pd.DataFrame(
+                [["Header 2"] + [""] * (len(cols) - 1)], columns=cols
+            )
+
+            # Row 3: table headers
+            table_headers = pd.DataFrame([cols], columns=cols)
+
+            final_df = pd.concat(
+                [header_row1, header_row2, table_headers, df], ignore_index=True
+            )
+            csv_text = StringIO()
+            final_df.to_csv(csv_text, index=False, header=False)
+            return csv_text.getvalue().encode("utf-8")
 
         # Create DataFrame from data
         df = pd.DataFrame(data)