fix(android): Handle invalid networks in network listener (#286)

Author: mikehardy

android/src/main/java/com/reactnativecommunity/netinfo/NetworkCallbackConnectivityReceiver.java

@@ -78,14 +78,16 @@ void updateAndSend() {
         }
 
         if (mNetwork != null) {
+            // This may return null per API docs, and is deprecated, but for older APIs (< VERSION_CODES.P)
+            // we need it to test for suspended internet
             networkInfo = getConnectivityManager().getNetworkInfo(mNetwork);
         }
 
         // Check to see if the network is temporarily unavailable or if airplane mode is toggled on
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
             isInternetSuspended = !mNetworkCapabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_NOT_SUSPENDED);
         } else {
-            if (mNetwork != null) {
+            if (mNetwork != null && networkInfo != null) {
                 NetworkInfo.DetailedState detailedConnectionState = networkInfo.getDetailedState();
                 if (!detailedConnectionState.equals(NetworkInfo.DetailedState.CONNECTED)) {
                     isInternetSuspended = true;