Configure model on the Surface level

When the focal points are not set, it is misleading
because after clicking on submit region parameter, the value for the
parameter is filled with the equations values (but the focal point list
empty) (attached), so one has to notice that this list is actually
empty. I would suggest to not change parameter values if there is no
focal points applied.

True, we should do that check and display a warning message for the user.
I've just added a task for this.

The bug is the following: when displaying a bullet list in surface model parameters (i.e. when only a few parameters are configurable), somehow the ui does not want anymore to apply the equation. (I was using the Epileptor model with only four configurable parameters)

Reproduction:
take any model you want and leave 4 or less parameters in ui_configurable_parameters in tvb/simulator/models.py
Start tvb
go to surface model parameters
apply equation
add focal point then fail

Does it behave the same way for you?
Yes, I can reproduce this.

Removing one focal point removes them all.
If you configure 2 different equations all focal point will get the first one. Equation for second param is set bu has no focal points.