added check for having type in VariableDeclaration::checkTypeRequirements()
added check for having type in VariableDeclaration::checkTypeRequirements()

ruchevits/solidity,shahankhatch/solidity,ruchevits/solidity,douglas-larocca/solidity,ruchevits/solidity,debris/solidity,chriseth/solidity-doc-test,ruchevits/solidity,ethers/solidity,chriseth/solidity