Small refactoring of config validation (#20801)

* Small refactoring of config validation

* local var that explains an operation

Author: iliakur

datadog_checks_dev/datadog_checks/dev/tooling/commands/validate/config.py

@@ -110,15 +110,14 @@ def config(ctx, check, sync, verbose):
             version = get_version_string(check)
 
         spec_file_content = read_file(spec_file_path)
-        default_temp = validate_default_template(spec_file_content)
-        spec = ConfigSpec(spec_file_content, source=source, version=version)
-        spec.load()
 
-        if not default_temp:
+        if not validate_default_template(spec_file_content):
             message = "Missing default template in init_config or instances section"
             check_display_queue.append(lambda message=message, **kwargs: echo_failure(message, **kwargs))
             annotate_error(spec_file_path, message)
 
+        spec = ConfigSpec(spec_file_content, source=source, version=version)
+        spec.load()
         if spec.errors:
             files_failed[spec_file_path] = True
             for error in spec.errors:
@@ -184,19 +183,14 @@ def config(ctx, check, sync, verbose):
 
 
 def validate_default_template(spec_file):
-    init_config_default = False
-    instances_default = False
     if 'template: init_config' not in spec_file or 'template: instances' not in spec_file:
         # This config spec does not have init_config or instances
         return True
-
     for line in spec_file.split('\n'):
-        if any("init_config/{}".format(template) in line for template in TEMPLATES):
-            init_config_default = True
-        if any("instances/{}".format(template) in line for template in TEMPLATES):
-            instances_default = True
-
-        if instances_default and init_config_default:
+        has_default_templates = any("init_config/{}".format(template) in line for template in TEMPLATES) and any(
+            "instances/{}".format(template) in line for template in TEMPLATES
+        )
+        if has_default_templates:
             return True
     return False