Fix a potential NPE in test_utils WebServerDispatcher

PiperOrigin-RevId: 429338648

testutils/src/main/java/com/google/android/exoplayer2/testutil/WebServerDispatcher.java

@@ -28,6 +28,7 @@ import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
 import androidx.annotation.Nullable;
 import com.google.android.exoplayer2.util.Util;
 import com.google.android.exoplayer2.util.Util;
 import com.google.common.base.Joiner;
 import com.google.common.base.Joiner;
+import com.google.common.base.Strings;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Maps;
@@ -239,7 +240,7 @@ public class WebServerDispatcher extends Dispatcher {
 
 
   /** Returns the path for a given {@link RecordedRequest}, stripping any query parameters. */
   /** Returns the path for a given {@link RecordedRequest}, stripping any query parameters. */
   public static String getRequestPath(RecordedRequest request) {
   public static String getRequestPath(RecordedRequest request) {
-    return Util.splitAtFirst(request.getPath(), "\\?")[0];
+    return Util.splitAtFirst(Strings.nullToEmpty(request.getPath()), "\\?")[0];
   }
   }
 
 
   /**
   /**