Bug: cannot parse with annonymous function parameter

[ryan-chae]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[x] Bug report  
[ ] Performance issue
[ ] Feature request
[ ] Documentation issue or request
[ ] Other... Please describe:

Current behavior

When there are some functions with anonymous parameter especially in interface, vvisp cannot parse that interface.

interface BridgeInterface {
    function makerToCompound(uint, uint, uint) external returns (uint);
    function compoundToMaker(uint, uint, uint) external;
    function refillFunds(uint) external;
}

If the above interface is in the solidity file, vvisp parses it as follows:

methods: {
      makerToCompound: function(, , , options) {
        const txData = contract.methods.makerToCompound(, , , ).encodeABI();
        options = {
          ...options,
          data: txData,
          platform: platform
        };
        return sendTx(contract.options.address, options ? options.value : 0, loadPrivateKey(), options);
      },
      compoundToMaker: function(, , , options) {
        const txData = contract.methods.compoundToMaker(, , , ).encodeABI();
        options = {
          ...options,
          data: txData,
          platform: platform
        };
        return sendTx(contract.options.address, options ? options.value : 0, loadPrivateKey(), options);
      },
      refillFunds: function(, options) {
        const txData = contract.methods.refillFunds(, ).encodeABI();
        options = {
          ...options,
          data: txData,
          platform: platform
        };
        return sendTx(contract.options.address, options ? options.value : 0, loadPrivateKey(), options);
      },
    }

Expected behavior

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?

Environment

vvisp version: 2.1.1


Environment:
- Node version: 11.14.0
- Operating system: osx catalina 10.15

Others: