[Bug]: Unhandled exception when adding 'All' to search "Sequence contains no elements"

[imanairconditioner]

Is there an existing issue for this?

• I have checked the existing issues for an existing issue. I even actually looked at the ones that are pinned to the top!

Operating System

Windows 11 Home 23H2

CKAN Version

v1.35.2.24280

Games

KSP 1, KSP 2

Game Version

Any

Did you make any manual changes to your game folder (i.e., not via CKAN)?

No response

Describe the bug

Holding shift or control when applying the 'all' non-filter causes an unhandled exception.

Steps to reproduce

1. Load an instance of KSP 1/2 into CKAN
2. Open 'filters' dropdown menu
3. Move mouse over 'all' operation
4. Commence holding shift or control
5. Click
6. Unhandled exception

System.InvalidOperationException: Sequence contains no elements
   at System.Linq.Enumerable.Aggregate[TSource](IEnumerable`1 source, Func`3 func)
   at CKAN.GUI.EditModSearches.MergeSearches(List`1 searches)
   at CKAN.GUI.ManageMods.<>c__DisplayClass86_1.<Filter>b__1()
   at CKAN.GUI.Util.Invoke[T](T obj, Action action)
   at CKAN.GUI.ManageMods.Filter(SavedSearch search, Boolean merge)
   at CKAN.GUI.ManageMods.FilterAllButton_Click(Object sender, EventArgs e)
   at System.Windows.Forms.ToolStripItem.RaiseEvent(Object key, EventArgs e)
   at System.Windows.Forms.ToolStripMenuItem.OnClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   at System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   at System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.ToolStripDropDown.OnMouseUp(MouseEventArgs mea)
   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
   at System.Windows.Forms.Control.WndProc(Message& m)
   at System.Windows.Forms.ToolStrip.WndProc(Message& m)
   at System.Windows.Forms.ToolStripDropDown.WndProc(Message& m)
   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

CKAN/GUI/Controls/EditModSearches.cs

Line 99 in 54bdf68

var merged = searches.Aggregate((search, newSearch) => search.MergedWith(newSearch));