fix(android): Fix crash when spotlight is enabled without defaultSidecarUrl

The code attempted to read defaultSidecarUrl without checking if the key
exists in the options map. This caused a NoSuchKeyException crash during
startup when spotlight was set to true in sentry.options.json without
providing defaultSidecarUrl.

Added key existence check to match iOS implementation behavior and prevent
the crash while maintaining backward compatibility.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: antonis

packages/core/RNSentryAndroidTester/app/src/test/java/io/sentry/react/RNSentryStartTest.kt

@@ -58,6 +58,15 @@ class RNSentryStartTest {
         assertEquals("http://localhost:8969/teststream", actualOptions.spotlightConnectionUrl)
     }
 
+    @Test
+    fun `when the spotlight option is enabled without defaultSidecarUrl, the spotlight is enabled and does not crash`() {
+        val options = JavaOnlyMap.of("spotlight", true)
+        val actualOptions = SentryAndroidOptions()
+        RNSentryStart.getSentryAndroidOptions(actualOptions, options, logger)
+        assert(actualOptions.isEnableSpotlight)
+        assertNull(actualOptions.spotlightConnectionUrl)
+    }
+
     @Test
     fun `when the spotlight option is disabled, the spotlight SentryAndroidOption is set to false`() {
         val options = JavaOnlyMap.of("spotlight", false)

packages/core/android/src/main/java/io/sentry/react/RNSentryStart.java

@@ -148,7 +148,9 @@ static void getSentryAndroidOptions(
     if (rnOptions.hasKey("spotlight")) {
       if (rnOptions.getType("spotlight") == ReadableType.Boolean) {
         options.setEnableSpotlight(rnOptions.getBoolean("spotlight"));
-        options.setSpotlightConnectionUrl(rnOptions.getString("defaultSidecarUrl"));
+        if (rnOptions.hasKey("defaultSidecarUrl")) {
+          options.setSpotlightConnectionUrl(rnOptions.getString("defaultSidecarUrl"));
+        }
       } else if (rnOptions.getType("spotlight") == ReadableType.String) {
         options.setEnableSpotlight(true);
         options.setSpotlightConnectionUrl(rnOptions.getString("spotlight"));