MediaHierarchyManager: prevent crash when previousLocation is -1

This can happen when expanding split shade on lock screen with no media.
Because we are expanding on lock screen in split shade, the transformation
type is TRANSITION.

Bug: 221193561
Test: Manually
Change-Id: Ide21f54d80113e646729cd40c42ed1039d6a0413

packages/SystemUI/src/com/android/systemui/media/MediaHierarchyManager.kt

@@ -785,7 +785,11 @@ class MediaHierarchyManager @Inject constructor(
      * @return true if this transformation is guided by an external progress like a finger
      */
     private fun isCurrentlyInGuidedTransformation(): Boolean {
-        return getTransformationProgress() >= 0
+        return hasValidStartAndEndLocations() && getTransformationProgress() >= 0
+    }
+
+    private fun hasValidStartAndEndLocations(): Boolean {
+        return previousLocation != -1 && desiredLocation != -1
     }
 
     /**