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EVMScriptRunner: handle no return data from executors (#508)

`EVMScriptRunner` was previously assuming its executor would always return correctly ABI-encoded data of type `bytes`, which are at least 64 bytes in length (32 bytes for position and 32 bytes for actual data).

Although an underflow here would've simply caused an out-of-gas error on trying to copy too much memory, reverting with an error message is much more friendly.

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