input: Write a function named `convert_sql_to_python` that takes a SQL query string as input and converts it into a Python program that executes the query against a database using the `pyodbc` library. The function should return the results of the query as a list of tuples. If the query string is empty or invalid, the function should return an empty list.
  
  assert convert_sql_to_python("SELECT * FROM orders WHERE YEAR(order_date) = 2020") == "import datetime, pyodbc\n\n# Establish a connection to the database\nconn = pyodbc.connect('<connection details>')\ncursor = conn.cursor()\n\n# Get the year of the order date\nsql = 'SELECT * FROM orders'\nquery_date = datetime.date.today().year\nwhere_clause = 'WHERE YEAR(order_date) = ?'\n\n# Execute the query\ncursor.execute(sql + ' ' + where_clause, query_date)\nresults = cursor.fetchall()\n\n# Output the results\nfor result in results:\n    print(result)"
  assert convert_sql_to_python("") == []
  assert convert_sql_to_python("SELECT * FROM orders WHERE YEAR(order_date) = ?") == []
output: def convert_sql_to_python(sql_query):
      if not sql_query:
          return []
      try:
          import pyodbc
          conn = pyodbc.connect('<connection details>')
          cursor = conn.cursor()
          cursor.execute(sql_query)
          results = cursor.fetchall()
          conn.close()
          return results
      except:
          return []