modify null

modules/mogo-module-tanlu/src/main/java/com/mogo/module/tanlu/fragment/TanluCardViewFragment.java

@@ -219,6 +219,9 @@ public class TanluCardViewFragment extends MvpFragment<IView, Presenter<IView>>
 
             @Override
             public void onStartNavi() {
+                if (mTanluModelData == null) {
+                    mTanluModelData = new TanluModelData(getContext());
+                }
                 getNavigationLineData();
             }