When summoning an armor stand with a dispenser/dropper on its head as equipment, the dispenser/dropper has no texture if a damage value 1 or greater is specified.

In a command block, when running this command:
summon ArmorStand ~ ~2 ~ {Equipment:[{},{},{},{},

]}
, an armor stand will be summoned 2 blocks above the command block like normal, except wearing a no texture block. However, of the Damage value is 0, or if the Damage tag is removed, the armor stand will be wearing a normal dispenser.
Please also note that I am looking for a dispenser with a damage value being worn by the armor stand. For example, if the damage value is 1, then the armor stand will be wearing a dispenser pointing up.