fix: crash with zero bottles

Whisky/AppDelegate.swift

@@ -24,8 +24,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
     func application(_ application: NSApplication, open urls: [URL]) {
         // Test if automatic window tabbing is enabled
-        // as it is disabled when ContentView appears.
-        // Prevents crashing
+        // as it is disabled when ContentView appears
         if NSWindow.allowsAutomaticWindowTabbing, let url = urls.first {
             // Reopen the file after Whisky has been opened
             // so that the `onOpenURL` handler is actually called

Whisky/Views/FileOpenView.swift

@@ -57,12 +57,14 @@ struct FileOpenView: View {
         }
         .frame(minWidth: 400, minHeight: 115)
         .onAppear {
-            selection = bottles.first(where: { $0.url == currentBottle })?.url ?? bottles[0].url
-
             if bottles.count <= 1 {
                 // If the user only has one bottle
                 // there's nothing for them to select
                 run()
+            } else if bottles.count > 0 {
+                // Makes sure there are more than 0 bottles.
+                // Otherwise, it will crash on the nil cascade
+                selection = bottles.first(where: { $0.url == currentBottle })?.url ?? bottles[0].url
             }
         }
     }