Skip contracts that have no bytecode (e.g., abstract contracts)

[marian-radu]

Abstract contracts and interfaces don't produce bytecode. The following test was failing because it expected bytecode when parsing the Context contract (an abstract contract) output.

	Running /Users/radumarian/revive-differential-tests/resolc-compiler-tests/fixtures/solidity/complex/defi/UniswapV2Router01/UniswapV2Pair/ERC20/test.json - Y M0
running 1 tests
test case_idx_0 ... FAILED, Failed to create the drivers for the various platforms: Failed to create driver for revive-dev-node-polkavm-resolc: Failed to initialize the execution state of the platform: Failed to produce the pre-linking compiled contracts: Compilation callback failed (cache miss path): Unexpected - Contract compiled with resolc has no bytecode

[0xOmarA]

Why did we only apply this change to resolc but not to solc?

[marian-radu]

There seems to be a difference in behavior between resolc and solc: solc returns empty bytecode if the contract is an interface, while resolc skips the bytecode key entirely.