fix failing test

test/solidity/localsTests/helper.js

@@ -5,6 +5,7 @@ var localDecoder = require('../../../babelify-src/solidity/localDecoder')
   Decode local variable
 */
 function decodeLocal (st, index, traceManager, callTree, verifier) {
+  try {
     traceManager.waterfall([
       traceManager.getStackAt,
       traceManager.getMemoryAt],
@@ -17,6 +18,9 @@ function decodeLocal (st, index, traceManager, callTree, verifier) {
           st.fail(error)
         }
       })
+  } catch (e) {
+    st.fail(e.message)
+  }
 }
 
 module.exports = {