idf.run() does not run if there is no idf filename

[santoshphilip]

idf.run() does not run if there is no idf filename

This error triggered by the fix of issue #401
Make sure your update the tests to include the case of idf not having a filename

[santoshphilip]

fixed issued #404

:Problem: idf.run() does not run if there is no idf filename
:Solution: fixed, so idf.run() works with no filename