hover preview validity checks

stop the asset browser version of the function if browser is opened outside of pac

check in case we change event class (property enums become wrong)

Author: pingu7867

lua/pac3/editor/client/asset_browser.lua

@@ -498,6 +498,8 @@ local function create_material_icon(path, grid_panel)
 
 	icon.Think = function()
 		if not preview_mats:GetBool() then return end
+		if not IsValid(pace.current_part) then return end
+		if not pace.IsActive() then return end
 		icon.hovering = icon:IsHovered()
 		if icon.hovering then
 			pace.current_part:SetProperty(pace.model_browser_part_key, mat_path)

lua/pac3/editor/client/panels/properties.lua

@@ -72,6 +72,7 @@ function pace.GoToPart(part)
 end
 
 local function install_generic_preview_hover(option, key, preview_value)
+	if not key then return end
 	option.Think = function()
 		option.hovering = option:IsHovered()
 		if option.hovering then
@@ -722,6 +723,8 @@ function pace.CreateSearchList(property, key, name, add_columns, get_list, get_c
 
 				if preview_hovers:GetBool() and not hoverpreview_excluded[property.CurrentKey] then
 					pnl.Think = function()
+						if not IsValid(pace.current_part) then return end
+						if not property or not property.CurrentKey then return end
 						pnl.hovering = pnl:IsHovered()
 						if pnl.hovering then
 							pace.current_part:SetProperty(property.CurrentKey, val)