test: another test for NullPointerException

Author: wind4869

src/main/java/org/tron/core/config/args/Args.java

@@ -225,9 +225,12 @@ public static void clearParam() {
     INSTANCE.storageDbDirectory = "";
     INSTANCE.storageIndexDirectory = "";
 
-    // WARNING: WILL DELETE DB STORAGE PATHS
-    INSTANCE.storage.deleteAllStoragePaths();
-    INSTANCE.storage = null;
+    // FIXME: INSTANCE.storage maybe null ?
+    if (INSTANCE.storage != null) {
+      // WARNING: WILL DELETE DB STORAGE PATHS
+      INSTANCE.storage.deleteAllStoragePaths();
+      INSTANCE.storage = null;
+    }
 
     INSTANCE.overlay = null;
     INSTANCE.seedNode = null;

src/main/java/org/tron/core/config/args/Storage.java

@@ -141,15 +141,11 @@ public void deleteAllStoragePaths() {
     }
 
     for (Property property : propertyMap.values()) {
-      // TODO: NullPointerException in CI, but normal in local
-      if (property != null) {
-        String path = property.getPath();
-        if (path != null) {
-          FileUtil.recursiveDelete(path);
-        }
+      String path = property.getPath();
+      if (path != null) {
+        FileUtil.recursiveDelete(path);
       }
     }
-
   }
 
   private boolean hasProperty(String dbName) {