Add contracts to some ItemUtils #605
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Sometimes IDEs will fret if you use an item after doing an `if (ItemUtils.isEmptyItem(item)) return;` because it doesn't know that the method is also a null check. These contracts will placate the IDE, removing the warnings, resulting in less confusion and less bytecode.
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Sometimes IDEs will fret if you use an item after doing an
if (ItemUtils.isEmptyItem(item)) return;because it doesn't know that the method is also a null check. These contracts will placate the IDE, removing the warnings, resulting in less confusion and less bytecode.