String IndexOutOfBounds Exception while using extensions in companion app

Ran tests on three devices, using both the ai2test server and ai2 server, with companion 2.73tu.

For me this has fixed the "String IndexOutOfBounds" error on Android 12 (genymotion) and Android 13 (Pixel 4a)

Well done Jeff !!

What remains is a continuing issue with Android 14/15 in loading a project with an updated extension which is returning the error of being unable to load the classes.jar. This is with tests on Android 15 Pixel 8a. This failed to load to the two projects I tested, which loaded just fine with Android 12 & 13.