A =  {"('All', 'Delhi', 'Mumbai')": {}, "('Container', 'Delhi', 'Mumbai')": {}, 
      "('Open', 'Delhi', 'Mumbai')": {12: [12, 22, 25], 7: [9, 5]},
      "('Open', 'Doon', 'Gurgaon')": {10: [1, 2, 24], 8: [4], 9: [28, 8], 7:[21]}}
      
new_dict = {k: v for k, v in A.items() if v}
print(new_dict)