fix: 🐛 ensure non-null collections for API schema properties

ApiSchema.java and IDocBuildTemplate.java have been updated to initialize
apiDatas and apiExceptionStatuses collections to prevent null pointer
exceptions. Additionally, postRender method in IDocBuildTemplate.java nowchecks for null apiSchema before processing, enhancing the robustness of
the documentation build process.

Author: linwumingshi

src/main/java/com/ly/doc/model/ApiSchema.java

@@ -21,6 +21,7 @@
 
 package com.ly.doc.model;
 
+import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -37,6 +38,9 @@ public class ApiSchema<T> {
     private List<ApiExceptionStatus> apiExceptionStatuses;
 
     public List<T> getApiDatas() {
+        if (apiDatas == null) {
+            apiDatas = new ArrayList<>();
+        }
         return apiDatas;
     }
 
@@ -45,6 +49,9 @@ public void setApiDatas(List<T> apiDatas) {
     }
 
     public List<ApiExceptionStatus> getApiExceptionStatuses() {
+        if (apiExceptionStatuses == null) {
+            apiExceptionStatuses = new ArrayList<>();
+        }
         return apiExceptionStatuses;
     }
 

src/main/java/com/ly/doc/template/IDocBuildTemplate.java

@@ -29,6 +29,7 @@
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Objects;
 
 /**
  * @author yu 2019/12/21.
@@ -46,12 +47,15 @@ default ApiSchema<T> getApiData(ProjectDocConfigBuilder projectBuilder) {
         DocMapping.init();
         DocBuildHelper docBuildHelper = DocBuildHelper.create(projectBuilder);
 
-        preRender(docBuildHelper);
+        this.preRender(docBuildHelper);
         // get candidate classes
-        Collection<JavaClass> candidateClasses = getCandidateClasses(projectBuilder, docBuildHelper);
-        ApiSchema<T> apiSchema = renderApi(projectBuilder, candidateClasses);
+        Collection<JavaClass> candidateClasses = this.getCandidateClasses(projectBuilder, docBuildHelper);
+        ApiSchema<T> apiSchema = this.renderApi(projectBuilder, candidateClasses);
 
-        postRender(docBuildHelper, apiSchema.getApiDatas());
+        if (Objects.isNull(apiSchema)) {
+            apiSchema = new ApiSchema<>();
+        }
+        this.postRender(docBuildHelper, apiSchema.getApiDatas());
 
         return apiSchema;
     }
@@ -67,8 +71,6 @@ default ApiSchema<T> getApiData(ProjectDocConfigBuilder projectBuilder) {
     ApiSchema<T> renderApi(ProjectDocConfigBuilder projectBuilder, Collection<JavaClass> candidateClasses);
 
 
-
-
     /**
      * post render
      *