Bail out if sync directory is deleted

src-tauri/yaak-sync/src/error.rs

@@ -6,7 +6,7 @@ use thiserror::Error;
 pub enum Error {
     #[error("Yaml error: {0}")]
     YamlParseError(#[from] serde_yaml::Error),
-    
+
     #[error("Sync parse error: {0}")]
     ParseError(String),
 
@@ -25,6 +25,9 @@ pub enum Error {
     #[error("Invalid sync file: {0}")]
     InvalidSyncFile(String),
 
+    #[error("Invalid sync directory: {0}")]
+    InvalidSyncDirectory(String),
+
     #[error("Watch error: {0}")]
     NotifyError(#[from] notify::Error),
 }