chore: fix deepsource issues

* use set comprehension instead of generator
* remove redundant else statement

Signed-off-by: Chinmay D. Pai <chinmaydpai@gmail.com>

frappe/database/database.py

@@ -776,7 +776,7 @@ class Database(object):
 				FROM information_schema.tables
 				WHERE table_schema NOT IN ('pg_catalog', 'information_schema')
 			""")
-			tables = set(d[0] for d in table_rows)
+			tables = {d[0] for d in table_rows}
 			frappe.cache().set_value('db_tables', tables)
 		return tables
 

frappe/database/schema.py

@@ -138,8 +138,7 @@ class DBTable:
 						if frappe.db.is_missing_column(e):
 							# Unknown column 'column_name' in 'field list'
 							continue
-						else:
-							raise
+						raise
 
 					if max_length and max_length[0][0] and max_length[0][0] > new_length:
 						if col.fieldname in self.columns: