1108 stepper programs that end with a declaration dont show correct result

[FYL2003]

This change solves the issue of not returning undefined when encounter empty program and not returning undefined when declaration appears.

[coveralls]

Pull Request Test Coverage Report for Build 8385542685

Details

• 2 of 2 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 80.979%

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Totals
Change from base Build 8383852478:	0.004%
Covered Lines:	10503
Relevant Lines:	12566

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💛 - Coveralls