Don't use null, and remove avatar

Author: yarisvt

gitlab4j-api/src/main/java/org/gitlab4j/api/ProjectApi.java

@@ -1144,7 +1144,6 @@ public Project createProject(Project project, String importUrl) throws GitLabApi
                 .withParam(
                         "only_allow_merge_if_all_status_checks_passed",
                         project.getOnlyAllowMergeIfAllStatusChecksPassed())
-                .withParam("avatar", project.getAvatar())
                 .withParam("group_with_project_templates_id", project.getGroupWithProjectTemplatesId())
                 .withParam("public_builds", project.getPublicBuilds())
                 .withParam("build_timeout", project.getBuildTimeout())
@@ -1547,7 +1546,6 @@ public Project updateProject(Project project) throws GitLabApiException {
                 .withParam(
                         "only_allow_merge_if_all_status_checks_passed",
                         project.getOnlyAllowMergeIfAllStatusChecksPassed())
-                .withParam("avatar", project.getAvatar())
                 .withParam("group_with_project_templates_id", project.getGroupWithProjectTemplatesId())
                 .withParam("public_builds", project.getPublicBuilds())
                 .withParam("build_timeout", project.getBuildTimeout())

gitlab4j-models/src/main/java/org/gitlab4j/api/models/Project.java

@@ -133,7 +133,6 @@ public String toString() {
     private AutoCancelPendingPipelines autoCancelPendingPipelines;
     private String repositoryObjectFormat;
     private Boolean onlyAllowMergeIfAllStatusChecksPassed;
-    private String avatar;
     private Integer groupWithProjectTemplatesId;
     private Boolean publicBuilds;
     private Integer buildTimeout;
@@ -1044,19 +1043,6 @@ public Project withBuildTimeout(Integer buildTimeout) {
         return this;
     }
 
-    public String getAvatar() {
-        return avatar;
-    }
-
-    public void setAvatar(String avatar) {
-        this.avatar = avatar;
-    }
-
-    public Project withAvatar(String avatar) {
-        this.avatar = avatar;
-        return this;
-    }
-
     public Boolean getMirrorTriggerBuilds() {
         return mirrorTriggerBuilds;
     }

gitlab4j-models/src/test/resources/org/gitlab4j/models/project.json

@@ -136,9 +136,8 @@
   "auto_cancel_pending_pipelines" : "enabled",
   "repository_object_format" : "sha1",
   "only_allow_merge_if_all_status_checks_passed" : false,
-  "avatar" : null,
-  "group_with_project_templates_id" : null,
-  "public_builds" : null,
+  "group_with_project_templates_id" : 1,
+  "public_builds" : true,
   "build_timeout" : 3600,
   "template_name" : "template",
   "emails_enabled" : true,