Merge pull request #530 from ethereum/fixCompareByteCode

src/helpers/util.js

@@ -154,10 +154,14 @@ module.exports = {
     * Compare bytecode. return true if the code is equal (handle swarm hash and library references)
     * @param {String} code1 - the bytecode that is actually deployed (contains resolved library reference and a potentially different swarmhash)
     * @param {String} code2 - the bytecode generated by the compiler (contains unresolved library reference and a potentially different swarmhash)
+                              this will return false if the generated bytecode is empty (asbtract contract cannot be deployed)
     *
     * @return {bool}
     */
   compareByteCode: function (code1, code2) {
+    if (code1 === code2) return true
+    if (code2 === '0x') return false // abstract contract. see comment
+
     var pos = -1
     while ((pos = code2.search(/__(.*)__/)) !== -1) {
       code2 = replaceLibReference(code2, pos)