Fixed a crashing issue when the error handler can’t create a window

src/scripts/boot.lua

@@ -1520,7 +1520,8 @@ function love.errhand(msg)
 	end
 
 	if not love.graphics.isCreated() or not love.window.isCreated() then
-		if not pcall(love.window.setMode, 800, 600) then
+		local success, status = pcall(love.window.setMode, 800, 600)
+		if not success or not status then
 			return
 		end
 	end

src/scripts/boot.lua.h

@@ -5194,9 +5194,12 @@ const unsigned char boot_lua[] =
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