fix: skip contracts with empty bytecode hash to avoid runtime error

[caffeinum]

What 💻

Fixed a bug where zkbuild would fail once it stumbles on an interface contract

Evidence 📷

Before:

RUST_BACKTRACE=1 zz zkbuild --is-system

...
Compiler run completed with warnings
ApprovalPaymaster -> Bytecode Hash: 01000137af7c45e8c9b466525248692879a3b6d8615affdddebc81f845b73913
GeneralPaymaster -> Bytecode Hash: 010000c96565b4e27d7d6337adc6ecb745ce8100a89d17db7f0627b8d0d7895c
Greeter -> Bytecode Hash: 010000839de6704080006a8df6674d13a03a3fd7fc9631b1f2c4b20e5282a1a0

Compiler run completed with warnings
MyPaymaster -> Bytecode Hash: 01000163ed132df1d2456f946f4410fc38a0cde1609cb222486f7f804e9a7d5d
NFTWalletMultisig -> Bytecode Hash: 010007ef05fda46bbb8dd9c68c5c0b7e3d56dff4637ba9ae5a785f559df943b1
TwoUserMultisig -> Bytecode Hash: 0100078fb016fc6f0779619a76125b0675c62479226d3c9b58904546f96b1fce
Artgene721 -> Bytecode Hash: 010008c16a9c75a245056bb8c4eba86776aa21b7c610432d285114f9176b838a
The application panicked (crashed).
Message:  called `Option::unwrap()` on a `None` value
Location: crates/common/src/zk_compile.rs:466

This is a bug. Consider reporting it at https://github.com/foundry-rs/foundry

  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   1: __ZN7rocksdb6ribbon6detail34BandingConfigHelper1MaybeSupportedILNS0_25ConstructionFailureChanceE1ELy128ELb0ELb0ELb1EE11GetNumSlotsEj<unknown>
      at <unknown source file>:<unknown line>

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
Run with RUST_BACKTRACE=full to include source snippets.
[1]    1372 abort      RUST_BACKTRACE=1 zkforge zkbuild --is-system

After:

RUST_BACKTRACE=1 zz zkbuild --is-system

...
Compiler run completed with warnings
ApprovalPaymaster -> Bytecode Hash: 01000137af7c45e8c9b466525248692879a3b6d8615affdddebc81f845b73913
GeneralPaymaster -> Bytecode Hash: 010000c96565b4e27d7d6337adc6ecb745ce8100a89d17db7f0627b8d0d7895c
Greeter -> Bytecode Hash: 010000839de6704080006a8df6674d13a03a3fd7fc9631b1f2c4b20e5282a1a0
...
Compiler run completed with warnings
MyPaymaster -> Bytecode Hash: 01000163ed132df1d2456f946f4410fc38a0cde1609cb222486f7f804e9a7d5d
NFTWalletMultisig -> Bytecode Hash: 010007ef05fda46bbb8dd9c68c5c0b7e3d56dff4637ba9ae5a785f559df943b1
TwoUserMultisig -> Bytecode Hash: 0100078fb016fc6f0779619a76125b0675c62479226d3c9b58904546f96b1fce
IArtgene721 -> emtpy file
IArtgene721Implementation -> emtpy file
Artgene721 -> Bytecode Hash: 010008c16a9c75a245056bb8c4eba86776aa21b7c610432d285114f9176b838a
Artgene721Factory -> Bytecode Hash: 010000d1411650ca7c2f517d321de56e9d72b0746b54b28c1ee6ad3d94d87105
BurnToMintExtension -> Bytecode Hash: 010001378d5685a67b457dc6fee8d4e8e02856a2c38736c898c45e9744aec987
ERC20SaleExtension -> Bytecode Hash: 0100013fbf58e5b37c3ff14eb0720a54c49f6fd53a200d6cbc01e2656a004443
LimitedSupply -> emtpy file
INFTExtension -> emtpy file
INFTURIExtension -> emtpy file
NFTExtension -> Bytecode Hash: 0100002933410a2655258434cf42f7751e945f58bbad7bbc650af7cff7412b8a
SaleControl -> emtpy file
IArtgene721 -> emtpy file
IArtgene721Implementation -> emtpy file
IArtgeneMarketplace -> emtpy file
IArtgenePlatform -> emtpy file
IERC4906 -> emtpy file
IERC721CommunityImplementation -> emtpy file
IERC721Community -> emtpy file
INFTURIExtension -> emtpy file
INFTExtension -> emtpy file
IRenderer -> emtpy file
AAFactory -> Bytecode Hash: 0100004f85b5183dd0f10e036e1405c079e2ca5e32cda128d7655bb29f45173a
Compiled Successfully

[dutterbutter]

Thanks for the contribution !! @caffeinum

Can you please run cargo fmt to address CI issue.

[caffeinum]

@dutterbutter done!