Unexplained Android build failure when drawables added.

If you create an Android project with version 7.0.0 or 7.1.0 and create a res directory in platforms/android/res the build fails with a confusing message. Some plugins create this directory and or have instructions are to copy drawables into this directory.

Potential solutions could be

1. More descriptive error
2. Better detection that is a Android Studio project would allow for better diagnoses of this failure
3. Suggest to user to move the drawables to the Android Studio project format indicating the presence of the res directory and the app directory

To reproduce 

1. cordova create test9 com.Test.Test9
2. cordova platform add android
3. mkdir -p platforms/android/res/drawable
4. cp image.png platforms/android/res/drawable
5. cordova build --verbose

The error

Generating platform-specific config.xml from defaults for android at /tmp/test9/platforms/android/res/xml/config.xml
cp: copyFileSync: could not write to dest file (code=ENOENT):/tmp/test9/platforms/android/res/xml/config.xmlMerging project's config.xml into platform-specific android config.xml
Parsing /tmp/test9/platforms/android/res/xml/config.xml failed
(node:20148) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: ENOENT: no such file or directory, open '/tmp/test9/platforms/android/res/xml/config.xml'