Fix nil pointer dereference in BlockNum precompile #1881
Merged
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The test curently panics: https://gist.github.com/anodar/94725241e9fc9bfdf3cab8e8d608bf42, but passes anyway since this is rpc call and test expects errors (checks that it's nil), the error currently is "method handler crashed".
Also sent #1882 to handle nil header in deserialization method.