I am trying to integrate a sound file that is triggered by a block which is added by an optional mod (Wild World's stalagmites/stalagtites for the cave ambience). Since it's optional, the users that don't have the mod always hear the sound because the game cannot identify the block.

Example:
This should play the sound, because the block ID is valid:

"blocks":[
 "minecraft:gold_ore"
]

This should not play the sound, because the block ID is NOT valid:

"blocks":[
 "minecraft:gol_or"
]

Unfortunately, the invalid block is still triggering the sound.