fix(provider): make source optional

android/src/main/java/dev/zoriya/omni/OmniPlayer.kt

@@ -177,7 +177,14 @@ class OmniPlayer : HybridOmniPlayerSpec() {
         }
     }
 
-    override fun setSource(src: Source) {
+    override fun setSource(src: Source?) {
+        if (src == null) {
+            runOnMainThreadSync {
+                player.setMediaItem(MediaItem.EMPTY)
+                player.prepare()
+            }
+            return
+        }
         val handleAudioFocus = (src.mixAudio ?: MixAudioMode.AUTO) != MixAudioMode.MIXWITHOTHERS
         val audioAttributes = AudioAttributes.Builder()
             .setUsage(C.USAGE_MEDIA)

android/src/main/java/dev/zoriya/omni/OmniPlayerFactory.kt

@@ -7,7 +7,7 @@ import com.margelo.nitro.omni.HybridOmniPlayerSpec
 import com.margelo.nitro.omni.Source
 
 class OmniPlayerFactory(val context: ThemedReactContext) : HybridOmniPlayerFactorySpec() {
-    override fun createPlayer(props: Source): HybridOmniPlayerSpec {
+    override fun createPlayer(props: Source?): HybridOmniPlayerSpec {
         return OmniPlayer().apply {
             setSource(props)
         }