tour: check if file content is set before storing in localStorage

file() returns undefined when there is no file to display, like on
https://tour.golang.org/welcome/2

Change-Id: Ia26719537949c9909947068d790f07e2eee8f9ff
Reviewed-on: https://go-review.googlesource.com/90075
Reviewed-by: Andrew Bonventre <andybons@golang.org>
1 file changed
tree: 6633e61387a178fa8e16fb6fc9ae8a9f34e2370b
  1. content/
  2. gotour/
  3. pic/
  4. reader/
  5. solutions/
  6. static/
  7. template/
  8. tools/
  9. tree/
  10. wc/
  11. .gitignore
  12. app.yaml
  13. AUTHORS
  14. codereview.cfg
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. LICENSE
  18. README.md
  19. TODO
  20. TRANSLATE
README.md

A Tour of Go is an introduction to the Go programming language.

The easiest way to install the tour locally is to install a binary release of Go and then run:

$ go tool tour

To install the tour from source, first set up a workspace and then run:

$ go get golang.org/x/tour/gotour

This will place a gotour binary in your workspace's bin directory.

Unless otherwise noted, the go-tour source files are distributed under the BSD-style license found in the LICENSE file.

Contributions should follow the same procedure as for the Go project: https://golang.org/doc/contribute.html