Synnefo

Steps to reproduce:

• Have an Image set without the 'size' metadata key
• create a machine using this Image, e.g., using kamaki or the API directly
• Attempt to access the UI: it fails on the initial load

Error report
-------------------
Code: -1
Type: JS Exception
Message: this.sel("image_size").text(image.get("metadata").values.size).attr is not a function
Module: UI
Details: this.sel("image_size").text(image.get("metadata").values.size).attr is not a function<br /><br />cre<br /><br />ateException()@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/lib/stacktrace.js:42<br /><br />run(null)@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/lib/stacktrace.js:27<br /><br />printStackTrace()@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/lib/stacktrace.js:18<br /><br />stacktrace()@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/utils.js:268<br /><br />handle_ui_error([object Object])@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/ui/web/ui_main_view.js:428<br /><br />(?)("error",[object Object])@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/lib/backbone.js:117<br /><br />trigger_error("CRITICAL","this.sel(\"image_size\").text(image.get(\"metadata\").values.size).attr is not a function",[object Object],[object Object])@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/ui/web/ui_vms_base_view.js:584<br /><br />onerror("this.sel(\"image_size\").text(image.get(\"metadata\").values.size).attr is not a function","http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/ui/web/ui_icon_view.js",557)@http://dev67.dev.grnet.gr:8000/static/snf-0.7/js/ui/web/ui_main_view.js:856

Please describe the actions that triggered the error:

This is a pretty far-fetched, but to improve robustness please make sure that the UI can handle lack of any missing metadata keys gracefully.

This is for v0.8.