refactor(prep_dataset_tag_add): remove redundant ifs and elses

now easier to read

discuss_data/dddatasets/views_prep.py

@@ -339,35 +339,26 @@ def prep_dataset_tag_add(request, ds_uuid, object_type):
     check_perms_403("edit_dsmo", request.user, ds.dataset_management_object)
     if request.method == "POST":
         tag = request.POST.get("%s-tag" % (object_type,), "").title()
-        if object_type == "language":
-            if len(tag) > 0:
+        if len(tag) > 0:
+            if object_type == "language":
                 ds.languages_of_data.add(tag)
-            tags = ds.get_language_tags()
-        elif object_type == "keyword":
-            if len(tag) > 0:
+            elif object_type == "keyword":
                 ds.keyword_tags.add(tag)
-            tags = ds.get_keyword_tags()
-        elif object_type == "methods_of_data_collection":
-            if len(tag) > 0:
+            elif object_type == "methods_of_data_collection":
                 ds.methods_of_data_collection.add(tag)
-            tags = ds.get_methods_of_data_collection_tags()
-        elif object_type == "methods_of_data_analysis":
-            if len(tag) > 0:
+            elif object_type == "methods_of_data_analysis":
                 ds.methods_of_data_analysis.add(tag)
-            tags = ds.get_methods_of_data_analysis_tags()
-        else:
-            tags = None
+
+    if object_type == "language":
+        tags = ds.get_language_tags()
+    elif object_type == "keyword":
+        tags = ds.get_keyword_tags()
+    elif object_type == "methods_of_data_collection":
+        tags = ds.get_methods_of_data_collection_tags()
+    elif object_type == "methods_of_data_analysis":
+        tags = ds.get_methods_of_data_analysis_tags()
     else:
-        if object_type == "language":
-            tags = ds.get_language_tags()
-        elif object_type == "keyword":
-            tags = ds.get_keyword_tags()
-        elif object_type == "methods_of_data_collection":
-            tags = ds.get_methods_of_data_collection_tags()
-        elif object_type == "methods_of_data_analysis":
-            tags = ds.get_methods_of_data_analysis_tags()
-        else:
-            tags = None
+        tags = None
 
     return render(
         request,