Make tree root config non-optional

src/config.rs

@@ -11,7 +11,7 @@ pub struct Config {
 #[derive(Debug, Serialize, Deserialize)]
 #[serde(deny_unknown_fields)]
 pub struct Tree {
-    pub root: Option<String>,
+    pub root: String,
     pub repos: Option<Vec<Repo>>,
 }
 

src/lib.rs

@@ -353,7 +353,7 @@ fn find_in_tree(path: &Path) -> Option<Tree> {
     }
 
     Some(Tree {
-        root: Some(root.into_os_string().into_string().unwrap()),
+        root: root.into_os_string().into_string().unwrap(),
         repos: Some(repos),
     })
 }