In some error states knockout fails to render main app page.

[Myles Metzler]

When operations.mode is null knockout.js will fail to render page app.html. This is caused by not trying to perform string operations when it could be null.

In this case the entire page would be in error anyway, the only real concern is that when the issue is resolved the user will have to refresh the page instead of it automatically fixing itself.

[Myles Metzler]

Addresses #118 "knockout.js fails to render app.html in error state".

→ <<cset b87d23a87754>>

[Myles Metzler]

Merged in dev-bugfix (pull request #13)

• Fixes #118 "knockout.js fails to render app.html in error state".
• Fixes #119 (P300 program details Abs High/Low affect monitor graph y axis range).
• Fixes #120 (Monitor Graph allowable range is invalid when a loops range min/max is zero).
• Fixes #121 (F4T control loops must be sequential).
• Fixes #122

Approved-by: Myles Metzler [e-mail]

→ <<cset 2cbf77672eb8>>