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GUI installation test failing on Windows R2026a #45

Description

@dmitrisvetlov

The portion of the install script that tests the GUI encounters an exception.

This is the error message:

Array indices must be positive integers or logical values.

This is the call stack:

'C:\Users\svetlov\OneDrive - Colostate\CSU-MS-Thesis\SSIT-workspace\SSIT\src\gui\model\updateModelswithinDropDown.m'
'C:\Users\svetlov\OneDrive - Colostate\CSU-MS-Thesis\SSIT-workspace\SSIT\src\gui\SSITGUI.mlapp'
'C:\Users\svetlov\OneDrive - Colostate\CSU-MS-Thesis\SSIT-workspace\SSIT\src\gui\SSITGUI.mlapp'
'C:\Program Files\MATLAB\R2026a\toolbox\matlab\appdesigner\runtime\+appdesigner\+internal\+service\@AppManagementService\runStartupFcn.m'
'C:\Program Files\MATLAB\R2026a\toolbox\matlab\appdesigner\runtime\+matlab\+apps\AppBase.m'
'C:\Users\svetlov\OneDrive - Colostate\CSU-MS-Thesis\SSIT-workspace\SSIT\src\gui\SSITGUI.mlapp'
'C:\Users\svetlov\OneDrive - Colostate\CSU-MS-Thesis\SSIT-workspace\SSIT\install.m'

The exception is raised on line 10 in updateModelswithinDropDown.m; value is empty; therefore, so is J.
On my screen, the UI figure is devoid of real contents (reactions, species, and inputs), and is somewhat off the screen; I cannot even move the window itself, though I can close it with Alt+F4.

I do not think the installation itself fails, but the tests cannot be run. The commit is the latest on June 15 (eac7e7c).

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