[ashell] No prompt print when run/parse a non exist JS file

[qiaojingx]

Description

When running or parsing a non exist JS file in ashell, No prompt print.

Test Code

ashell

Steps to Reproduction

1. acm> run test.js (test.js does not exist in ashell)
2. acm> parse test.js (test.js does not exist in ashell)

Actual Result

No prompt print.

Expected Result

Prompt like File not found print.

Test Builds

Branch	Commit Id	Target Device	Test Date	Result
master	cb6f7ba	Arduino 101	Feb 13, 2018	Fail

Additional Information