- remove disk from the list if does not have path (prevent to show MacintoshHD - Data partition) (#180)

Modules/Disk/readers.swift

@@ -135,10 +135,12 @@ internal class CapacityReader: Reader<DiskList> {
             }
         }
         
-        if d.path != nil {
-            d.free = freeDiskSpaceInBytes(d.path!.absoluteString)
+        if d.path == nil {
+            return nil
         }
         
+        d.free = freeDiskSpaceInBytes(d.path!.absoluteString)
+        
         let partitionLevel = d.BSDName.filter { "0"..."9" ~= $0 }.count
         if let parent = self.getDeviceIOParent(DADiskCopyIOMedia(disk), level: Int(partitionLevel)) {
             d.parent = parent