more defensive coding: guard against a non-iterable loclist #4912
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Sometimes `s:HandleExit` can execute a deferred linter callback, which ends up setting the `l:loclist` that's passed into `ale#engine#HandleLoclist` at the end of `s:HandleExit` to a dictionary. This dictionary cannot be iterated over, and thus errors out. Guard against trying to iterate over values that don't make sense.
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Sometimes
s:HandleExitcan execute a deferred linter callback, which ends up setting thel:loclistthat's passed intoale#engine#HandleLoclistat the end ofs:HandleExitto a dictionary. This dictionary cannot be iterated over, and thus errors out.Guard against trying to iterate over values that don't make sense.