[Speedgrader] Grade Validation Error in Speedgrader

[swind]

When an assignment is configured to Display Grade as Points, Speedgrader will not accept non-numeric values in the grade field. If a letter grade or other invalid input is entered, the grade field simply clears once it's deselected and no warning message is displayed to the user.

Graders who enter letter grades instead of points may not realize these scores aren't being saved.

Speedgrader should display an invalid grade warning icon and message consistent with the warnings displayed in the Gradebook.

Gradebook warning:

Speedgrader mockup:

[lekern]

Agree. There really should be a warning ...