Using wildcard selector * in scoreboard operation creates entries for all tracked entities with scores

When using the wildcard selector * in scoreboard operation, the scoreboard is filled with entries with score 0 for all tracked entities with scores.

Steps to reproduce:

1. Create scoreboards

   /scoreboard objectives add board1 dummy
   /scoreboard objectives add board2 dummy
   

1. Fill in some scores

   /scoreboard players set player1 board1 10
   /scoreboard players set player2 board2 3
   /scoreboard players set player3 board2 5
   

1. Tracked entities should show 3 entries

    /scoreboard players list 

1. Scoreboard board2 should have only 2 entries for player2 and player3

    /scoreboard objectives setdisplay sidebar board2

1. Use wildcard, and set score of player2 to max

   /scoreboard players operation player2 board2 > * board2
   

1. Score of player2 is set to max but the scoreboard board2 has now an extra entry for player1 with score 0

   player2 5
   player3 5
   player1 0