🎨 Cleanup code

src/main/java/org/b3log/solo/processor/console/CategoryConsole.java

@@ -51,7 +51,8 @@ import java.util.Set;
  * Category console request processing.
  *
  * @author <a href="http://88250.b3log.org">Liang Ding</a>
- * @version 1.1.3.5, Jul 22, 2019
+ * @author <a href="https://hacpai.com/member/lzh984294471">lzh984294471</a>
+ * @version 1.1.3.6, Sep 1, 2019
  * @since 2.0.0
  */
 @RequestProcessor
@@ -170,7 +171,7 @@ public class CategoryConsole {
             final StringBuilder tagBuilder = new StringBuilder();
             final List<JSONObject> tags = (List<JSONObject>) result.opt(Category.CATEGORY_T_TAGS);
             for (final JSONObject tag : tags) {
-                if (tag == null || !tag.has(Tag.TAG_TITLE)){
+                if (null == tag || !tag.has(Tag.TAG_TITLE)) { // 修复修改分类时空指针错误 https://github.com/b3log/solo/pull/12876
                     continue;
                 }
                 tagBuilder.append(tag.optString(Tag.TAG_TITLE)).append(",");

src/main/java/org/b3log/solo/service/CategoryQueryService.java

@@ -43,7 +43,8 @@ import java.util.List;
  * Category query service.
  *
  * @author <a href="http://88250.b3log.org">Liang Ding</a>
- * @version 1.0.1.3, Jan 15, 2019
+ * @author <a href="https://hacpai.com/member/lzh984294471">lzh984294471</a>
+ * @version 1.0.1.4, Sep 1, 2019
  * @since 2.0.0
  */
 @Service
@@ -115,7 +116,7 @@ public class CategoryQueryService {
             for (final JSONObject relation : relations) {
                 final String tagId = relation.optString(Tag.TAG + "_" + Keys.OBJECT_ID);
                 final JSONObject tag = tagRepository.get(tagId);
-                if (tag == null){
+                if (null == tag) { // 修复修改分类时空指针错误 https://github.com/b3log/solo/pull/12876
                     continue;
                 }
                 ret.add(tag);