Minecraft 1.8-pre3, Minecraft 1.8
Microsoft Windows 8.1 Java 1.8.0_11 64 bit Intel i7 12GB RAM Nvidia GeForce 840M
First place an Armor Stand.
Second use the
Third rightclick the chest plate to get 0 iron chestplates in your inventory
Fourth duplicate it with the pickblock button (middleclick) and put 1 in you armor slot
Fifth use /clear
Result: The 0 iron chestplates in your armor slot are still there.
And yes this bug report is useless because why whould anyone have 0 of an item but it's still a bug