Now throws exception when tag lists are referenced when using the V3 API (#172).

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

@@ -651,9 +651,7 @@ public class ProjectApi extends AbstractApi implements Constants {
             formData.withParam("public", isPublic);
             
             if (project.getTagList() != null && !project.getTagList().isEmpty()) {
-                // What would be the preferred way to deal with this, as the V3 API doesn't
-                // appear to do anything if you send in the tag_list? Could either just ignore,
-                // or throw an exception.
+                throw new IllegalArgumentException("GitLab API v3 does not support tag lists when creating projects");
             }
         } else {
             Visibility visibility = (project.getVisibility() != null ? project.getVisibility() :
@@ -892,9 +890,7 @@ public class ProjectApi extends AbstractApi implements Constants {
             formData.withParam("public", isPublic);
             
             if (project.getTagList() != null && !project.getTagList().isEmpty()) {
-                // What would be the preferred way to deal with this, as the V3 API doesn't
-                // appear to do anything if you send in the tag_list? Could either just ignore,
-                // or throw an exception.
+                throw new IllegalArgumentException("GitLab API v3 does not support tag lists when updating projects");
             }
         } else {
             Visibility visibility = (project.getVisibility() != null ? project.getVisibility() :

src/test/java/org/gitlab4j/api/TestProjectApi.java

@@ -171,7 +171,7 @@ public class TestProjectApi {
                 .withWikiEnabled(true)
                 .withSnippetsEnabled(true)
                 .withVisibility(Visibility.PUBLIC)
-                .withTagList(Arrays.asList("tag1","tag2"));
+                .withTagList(Arrays.asList("tag1", "tag2"));
 
         Project newProject = gitLabApi.getProjectApi().createProject(project);
         assertNotNull(newProject);
@@ -196,7 +196,7 @@ public class TestProjectApi {
                 .withWikiEnabled(true)
                 .withSnippetsEnabled(true)
                 .withVisibility(Visibility.PUBLIC)
-                .withTagList(Arrays.asList("tag1","tag2"));
+                .withTagList(Arrays.asList("tag1", "tag2"));
 
         Project newProject = gitLabApi.getProjectApi().createProject(project);
         assertNotNull(newProject);