Fix StubExecutable crash#1501

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Glebka wants to merge 1 commit intoSquirrel:developfrom

Glebka:bugfix/stub-executable-crash

Commits on Jun 13, 2019

Return empty string from FindLatestAppDir() in case of error instead of NULL. Related to Squirrel/Squirrel.Windows#1500
Hlieb Romanov
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