Check for active catalyst instance when using RNLog

Summary:
Works around a crash identified by Sapienz in D39852058 (30411ae1a4)

These logs will still be logged to the console, as they were before

Changelog: [Internal]

Reviewed By: NickGerleman

Differential Revision: D39968830

fbshipit-source-id: 5d7a5d935e85a7d67e7780d95b2253e50888ad90

ReactAndroid/src/main/java/com/facebook/react/util/RNLog.java

@@ -61,7 +61,7 @@ public class RNLog {
    * @param message The message to log.
    */
   public static void w(ReactContext context, String message) {
-    RNLog.logInternal(context, message, WARN);
+    logInternal(context, message, WARN);
     FLog.w(ReactConstants.TAG, message);
   }
 
@@ -72,7 +72,7 @@ public class RNLog {
    * @param message The message to log.
    */
   public static void e(ReactContext context, String message) {
-    RNLog.logInternal(context, message, ERROR);
+    logInternal(context, message, ERROR);
     FLog.e(ReactConstants.TAG, message);
   }
 
@@ -88,7 +88,7 @@ public class RNLog {
 
   private static void logInternal(ReactContext context, String message, int level) {
     if (level >= MINIMUM_LEVEL_FOR_UI) {
-      if (context != null && message != null) {
+      if (context != null && context.hasActiveReactInstance() && message != null) {
         context.getJSModule(RCTLog.class).logIfNoNativeHook(levelToString(level), message);
       }
     }