Merge branch 'development' into feature/website/top-bar-redesign

* development: (63 commits)
  Update The Ocean logo
  Fix artifacts paths
  Create an artifacts folder
  Introduce a var
  Add removeHexPrefix util method
  CHeck if ABI exists
  Improve the readability of the check for should compile
  Use named constants
  Add a comment
  Fix comments
  Rename args to constructor-args
  Fix a typo
  Define a separator const
  Move artifacts from src/artifacts to artifacts/v1
  Fix sol-cov to work with the new artifacts format
  Implement new artifacts format
  Publish
  Updated CHANGELOGS
  Make node types a dependency
  Fix type errors in CSS properties
  ...

1 files changed, 3 insertions, 2 deletions

diff --git a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
index 0a9b99ae4..f68d7eb29 100644
--- a/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
+++ b/packages/subproviders/src/subproviders/base_wallet_subprovider.ts
@@ -9,9 +9,10 @@ import { Subprovider } from './subprovider';
 
 export abstract class BaseWalletSubprovider extends Subprovider {
     protected static _validateTxParams(txParams: PartialTxParams) {
-        assert.isETHAddressHex('to', txParams.to);
+        if (!_.isUndefined(txParams.to)) {
+            assert.isETHAddressHex('to', txParams.to);
+        }
         assert.isHexString('nonce', txParams.nonce);
-        assert.isHexString('gas', txParams.gas);
     }
     private static _validateSender(sender: string) {
         if (_.isUndefined(sender) || !addressUtils.isAddress(sender)) {