Properly handle empty args with new shellquote lib

Fixes #1454

internal/action/command.go

@@ -349,6 +349,9 @@ func (h *BufPane) OpenCmd(args []string) {
 			InfoBar.Error("Error parsing args ", err)
 			return
 		}
+		if len(args) == 0 {
+			return
+		}
 		filename = strings.Join(args, " ")
 
 		open := func() {
@@ -966,6 +969,10 @@ func (h *BufPane) HandleCommand(input string) {
 		return
 	}
 
+	if len(args) == 0 {
+		return
+	}
+
 	inputCmd := args[0]
 
 	if _, ok := commands[inputCmd]; !ok {