input: Write a function to print a formatted table of grades for a given set of students. The function should take a list of dictionaries where each dictionary represents a student with keys 'name' and 'grade'. The output should be a table with columns 'Name' and 'Grade', and the rows should be populated with the respective student names and grades.
  assert print_grade_table([
      {'name': "John", 'grade': 92},
      {'name': "Alice", 'grade': 95},
      {'name': "Bob", 'grade': 87}
  ])==None
  assert print_grade_table([
      {'name': "Emma", 'grade': 88},
      {'name': "Oliver", 'grade': 90},
      {'name': "Sophia", 'grade': 94}
  ])==None
  assert print_grade_table([])==None
output: def print_grade_table(students):
      if not students:
          return
      print(f"{'Name':<10} {'Grade':<5}")
      for student in students:
          print(f"{student['name']:<10} {student['grade']:<5}")