A few commands are missing check for open browse context

[vkatsikaros]

After #865 I noticed that a few other commands miss a check for open browse context:

• 8.4 Get Timeouts
• 8.5 Set Timeouts:
• 10.3 Switch To Window
• 10.4 Get Window Handles

I'll provide a patch for this in the next days.

[andreastt]

These intentionally don’t have checks for an open top-level browsing context because they are meant to function without one.

[vkatsikaros]

@andreastt ah ok, sorry for the false alarm then. So the 6.3 Processing Model will catch if there is a missing session id.

[andreastt]

For example, we explicitly don’t check if there is an open top-level browsing context when calling Switch To Window because the old browsing context may have disappeared intentionally. It should then still be possible to switch to one of the other windows/tabs you have open. The same argument applies to Get Window Handles.

Similarly for Get Timeouts/Set Timeouts, the idea is that these should be unrelated to any state because they are simple getters and setters.