Update InternetConnection check to skip check when uri scheme is null

When we created androidTests, in the past, they always had a URI pointing to a resource, therefore we always had a URI scheme. With texture input, this will not longer be the case (EditedMediaItems's may have URI.EMPTY, which have a null scheme) so we need to check for this so tests don't falsely fail.

PiperOrigin-RevId: 528848411

library/transformer/src/androidTest/java/com/google/android/exoplayer2/transformer/TransformerAndroidTestRunner.java

@@ -274,8 +274,8 @@ public class TransformerAndroidTestRunner {
     for (EditedMediaItemSequence sequence : composition.sequences) {
       for (EditedMediaItem editedMediaItem : sequence.editedMediaItems) {
         Uri mediaItemUri = checkNotNull(editedMediaItem.mediaItem.localConfiguration).uri;
-        String scheme = checkNotNull(mediaItemUri.getScheme());
-        if ((scheme.equals("http") || scheme.equals("https"))) {
+        String scheme = mediaItemUri.getScheme();
+        if (scheme != null && (scheme.equals("http") || scheme.equals("https"))) {
           assumeTrue(
               "Input network file requested on device with no network connection. Input file"
                   + " name: "