Merge pull request #8 from bitcat365/fix/transfer

fix transfer failed when nonce is 0

src/background/api/index.js

@@ -64,7 +64,7 @@ function _getGQLVariables(payload, signature, includeAmount = true) {
     variables.scalar = signature.scalar
   }
   for (let pro in variables) {
-    variables[pro] = String(variables[pro] || "")
+    variables[pro] = String(typeof variables[pro] === "undefined" ?  "" : variables[pro])
   }
   return variables
 }