MSOB7Y

fix: crash in `libamplituda-native-lib.so` caused by `null pointer dereference`

1

closes #90 i tested with the sample file there (as well as some other files) and the issue seems fixed so far, pls review and merge if possible to test,...

**Describe the bug** When extracting from an alac file (in .m4a container) a crash happens in `libamplituda-native-lib.so` caused by null pointer dereference (see trace below) (note: sometimes i get normal...

for some reason, the type in `ScreenRetriever._handleScreenEvent()` can be null. just added a quick null check exception details: ``` type 'Null' is not a subtype of type 'String' in type...