Fix crash when right SideMenu is undefined (#559)

android/app/src/main/java/com/reactnativenavigation/views/SideMenu.java

@@ -117,6 +117,9 @@ public class SideMenu extends DrawerLayout {
     }
 
     private void setStyle(SideMenuParams params) {
+        if (params == null) {
+            return;
+        }
         if (params.disableOpenGesture) {
             setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_CLOSED, params.side.gravity);
         }