Do not throw error in unmount

Author: andrewosh

lib/fuse/index.js

@@ -335,7 +335,7 @@ class FuseManager extends EventEmitter {
     await ensureFuse()
     const self = this
 
-    if (!this._rootMnt) throw new Error('Cannot unmount if the root drive is not mounted.')
+    if (!this._rootMnt) return
 
     // If a mountpoint is not specified, then it is assumed to be the root mount.
     if (!mnt) return unmountRoot()