fixed get_table_json

This would throw a subsequent error
['[Database] - get_table_as_json ERROR:', TypeError("'NoneType' object is not iterable")]

server/db/db_helper.py

@@ -8,6 +8,7 @@ sys.path.extend([f"{INSTALL_PATH}/server"])
 from helper import if_byte_then_to_str
 from logger import mylog
 
+
 #-------------------------------------------------------------------------------
 #  Return the SQL WHERE clause for filtering devices based on their status.
 
@@ -41,7 +42,6 @@ def get_device_condition_by_status(device_status):
     return conditions.get(device_status, 'WHERE 1=0')
 
 
-
 #-------------------------------------------------------------------------------
 #  Creates a JSON-like dictionary from a database row
 def row_to_json(names, row):
@@ -71,6 +71,7 @@ def row_to_json(names, row):
 
     return rowEntry
 
+
 #-------------------------------------------------------------------------------
 def sanitize_SQL_input(val):
     """
@@ -116,7 +117,6 @@ def get_date_from_period(period):
     return period_sql
 
 
-
 #-------------------------------------------------------------------------------
 def print_table_schema(db, table):
     """
@@ -195,16 +195,11 @@ def get_table_json(sql, sql_query):
         sql.execute(sql_query)
         column_names = [col[0] for col in sql.description]
         rows = sql.fetchall()
+        data = [row_to_json(column_names, row) for row in rows] if rows else []
+        return json_obj({"data": data}, column_names if rows else [])
     except sqlite3.Error as e:
         mylog('verbose', ['[Database] - SQL ERROR: ', e])
-        return json_obj({}, [])  # return empty object
-
-    if (rows):
-        result = {"data": [row_to_json(column_names, row) for row in rows]}
-        return json_obj(result, column_names)
-    else:
-        result = {"data": []}
-        return json_obj(result, column_names)
+        return json_obj({"data": []}, [])  # return empty object
 
 
 #-------------------------------------------------------------------------------