Introduce an ERC-1155 _exists() function#2185

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KaiRo-at wants to merge 2 commits intoOpenZeppelin:masterfrom KaiRo-at:erc1155-exists

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Commits on Jul 29, 2020

add an _exists() function to be more in line with the ERC-721 implementation and satisfy https://twitter.com/xanderatallah/status/1232124941425881089
KaiRo-at
committed
rework _exists() and _registerToken() slightly, do not require() it in other functions
KaiRo-at
committed