MINOR: Fix column merge error lineage (#16670)

* MINOR: Fix Column merge error

* append only when col lineage available

* pyformat

(cherry picked from commit 72ed09d)

ingestion/src/metadata/ingestion/ometa/mixins/lineage_mixin.py

@@ -52,11 +52,24 @@ def _merge_column_lineage(
         self, original: List[Dict[str, Any]], updated: List[Dict[str, Any]]
     ):
         temp_result = []
-        for column in original or []:
-            temp_result.append((*column.get("fromColumns", []), column.get("toColumn")))
-        for column in updated or []:
-            data = column.dict()
-            temp_result.append((*data.get("fromColumns", []), data.get("toColumn")))
+        try:
+            for column in original or []:
+                if column.get("toColumn") and column.get("fromColumns"):
+                    temp_result.append(
+                        (*column.get("fromColumns", []), column.get("toColumn"))
+                    )
+            for column in updated or []:
+                if not isinstance(column, dict):
+                    data = column.dict()
+                else:
+                    data = column
+                if data.get("toColumn") and data.get("fromColumns"):
+                    temp_result.append(
+                        (*data.get("fromColumns", []), data.get("toColumn"))
+                    )
+        except Exception as exc:
+            logger.debug(f"Error while merging column lineage: {exc}")
+            logger.debug(traceback.format_exc())
         return [
             {"fromColumns": list(col_data[:-1]), "toColumn": col_data[-1]}
             for col_data in set(temp_result)