Swift compatibility for NSAppleScript

Originator:joseph.m.mclaughlin
Number:rdar://23459176 Date Originated:11/09/15
Status:Open Resolved:
Product:OS X SDK Product Version:Xcode 7.1
Classification:Enhancement Reproducible:
 
Summary:
Although `executeAndReturnError(errorInfo:)` and `executeAppleEvent(event:errorInfo:)` can return `nil`, they aren't marked as having a `_Nullable` return type. This prevents using `if let` and `guard` statements and instead requires checking the `errorInfo` dictionary to avoid crashing.

Expected Results:
`executeAndReturnError(errorInfo:)` and `executeAppleEvent(event:errorInfo:)` should both have a return type of `NSAppleEventDescriptor * _Nullable`.

Actual Results:
`executeAndReturnError(errorInfo:)` and `executeAppleEvent(event:errorInfo:)` both have a return type of `NSAppleEventDescriptor *` (_Nonnull).

Version:
Xcode 7.1

Notes:
As noted above, this is an enhancement, as the current `errorInfo` parameter can be used to check if the function(s) completed successfully before accessing the resulting variable.

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