remove list comprehension to handle None in source_map.get() to preve…

…nt mypy error

dbt/adapters/clickhouse/impl.py

@@ -207,11 +207,11 @@ def check_incremental_schema_changes(
         source_not_in_target = [column for column in source if column.name not in target_map.keys()]
         target_not_in_source = [column for column in target if column.name not in source_map.keys()]
         target_in_source = [column for column in target if column.name in source_map.keys()]
-        changed_data_types = [
-            column
-            for column in target_in_source
-            if column.dtype != source_map.get(column.name).dtype
-        ]
+        changed_data_types = []
+        for column in target_in_source:
+            source_column = source_map.get(column.name)
+            if source_column is not None and column.dtype != source_column.dtype:
+                changed_data_types.append(column)
 
         clickhouse_column_changes = ClickHouseColumnChanges(
             columns_to_add=target_not_in_source,