James D. Lin e6e35ee205 Fix potential null pointer dereference in FlutterDartProject (flutter/engine#6035)
If `FlutterDartProject` found an `FLTLibraryPath` entry in an iOS
application's `Info.plist`, it assumed that values that were valid
filesystem paths were paths to bundles.  If the attempt to retrieve
the `NSBundle` fails, `FlutterDartProject` ignored the failure and
then would assign `nil` to a C++ `std::string`, resulting in a null
pointer dereference.

Add some failure checks to prevent this.
2018-08-16 17:40:33 -07:00
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