Fixes the issues with the database that have been forcing us to have #10823 test-merged for half a year (#15061)

* Don't try to make a query on a client that doesn't exist

* If this is actually why it's been shitting the bed, I swear to god

code/controllers/configuration/entries/dbconfig.dm

@@ -49,5 +49,5 @@
 	min_val = 1
 
 /datum/config_entry/number/max_concurrent_queries
-	config_entry_value = 25
+	default = 25
 	min_val = 1

modular_skyrat/modules/title_screen/code/new_player.dm

@@ -228,6 +228,9 @@
  * Shows the player a list of current polls, if any.
  */
 /mob/dead/new_player/proc/playerpolls()
+	if(!usr || !client)
+		return
+
 	var/output
 	if (!SSdbcore.Connect())
 		return