Opcode 0AE0 bug

[spaceeinstein]

For both games, if there are more than one registered custom text and 0AE0 attempts to remove a nonexistent key, the game gets stuck in a loop and freezes. For example:

0ADF: ADD_TEXT_LABEL "TEST1" "TEST1"
0ADF: ADD_TEXT_LABEL "TEST2" "TEST2"
0AE0: REMOVE_TEXT_LABEL "TEST1"
0AE0: REMOVE_TEXT_LABEL "TEST1"

Removing a nonexistent key is fine if there is zero or one registered custom text.