ohaux closure search getfenv error (when setting parentScript)

[tip52]

Found a temp fix for myself: pcall setting the parentScript and only continue if its not nil.

Didn't make a pull request because:

1: I don't know how lol
2: There is probably a better way of fixing it

[tip52]

Additional information: the error looks like this: invalid argument #1 to 'getfenv' (number expected, got (random data type here)