prairiedog: if the variant doesn't support boot settings be okay with…

… None

sources/api/prairiedog/src/bootconfig.rs

@@ -117,8 +117,14 @@ fn get_boot_config_settings<P>(config_path: P) -> Result<Option<BootSettings>>
 where
     P: AsRef<Path>,
 {
-    let config_str = fs::read_to_string(config_path.as_ref()).context(error::ReadFileSnafu {
-        path: config_path.as_ref().to_path_buf(),
+    let config_path = config_path.as_ref();
+    if !config_path.try_exists().context(error::ReadFileSnafu {
+        path: config_path.to_path_buf(),
+    })? {
+        return Ok(None);
+    }
+    let config_str = fs::read_to_string(config_path).context(error::ReadFileSnafu {
+        path: config_path.to_path_buf(),
     })?;
     toml::from_str(config_str.as_str()).context(error::InputTomlSnafu)
 }