diff --git a/.vscode/launch.json b/.vscode/launch.json
index 0bb267d..c3af61b 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -12,7 +12,7 @@
             "env": {
                 "METRIC__INTERVAL": "5",
                 "METRIC__LOG__ENABLED": "True",
-                "METRIC__DISK__PATHS": "[\"/var\", \"/\", \"/dev\"]",
+                "METRIC__EXTERNAL__ENABLED": "True",
                 "METRIC__EXTERNAL__EXECUTABLES": "[\"${workspaceFolder}/example/dummy-metric\"]",
             },
             "justMyCode": true
diff --git a/kiwi_simple_metrics/metrics/_report.py b/kiwi_simple_metrics/metrics/_report.py
index e974ab1..5cf4044 100644
--- a/kiwi_simple_metrics/metrics/_report.py
+++ b/kiwi_simple_metrics/metrics/_report.py
@@ -102,6 +102,9 @@ class Report:
 
         reports = [data.report for data in get_data()]
 
+        if not reports:
+            return None
+
         return cls(
             result=settings.report_outer.format(
                 name=settings.name,
diff --git a/kiwi_simple_metrics/settings/metric.py b/kiwi_simple_metrics/settings/metric.py
index d1b5b68..dc597b8 100644
--- a/kiwi_simple_metrics/settings/metric.py
+++ b/kiwi_simple_metrics/settings/metric.py
@@ -1,8 +1,8 @@
 import math
 from typing import Any, Literal
 
-from pydantic import (BaseModel, DirectoryPath, Field, FieldValidationInfo,
-                      FilePath, field_validator)
+from pydantic import (BaseModel, DirectoryPath, FieldValidationInfo, FilePath,
+                      field_validator)
 
 
 class MetricSettings(BaseModel):
@@ -81,15 +81,16 @@ class DiskMS(MetricSettings):
     count: int | None = 1
 
     # paths to check for disk space
-    paths: list[DirectoryPath] = Field(default_factory=list)
+    paths: list[DirectoryPath] = [DirectoryPath("/")]
 
 
 class ExternalMS(MetricSettings):
     name: str = "External Metric"
+    enabled: bool = False
     threshold: float = 0
 
     # path to executable files
-    executables: list[FilePath] = Field(default_factory=list)
+    executables: list[FilePath] = []
 
     # wait at most this many seconds for each executable
     timeout: int = 60