Fixes spawning with psionics. (#16969)

Fixes a error when sanitizing a character that doesnt have psionics.
Fixes #16966

Co-authored-by: Werner <Arrow768@users.noreply.github.com>

code/modules/client/preference_setup/general/07_psionics.dm

@@ -49,6 +49,9 @@
 	)
 
 /datum/category_item/player_setup_item/general/psionics/load_special(savefile/S)
+	if(!pref.psionics)
+		pref.psionics = "{}"
+
 	var/before = pref.psionics
 	try
 		pref.psionics = json_decode(pref.psionics)

code/modules/client/preferences.dm

@@ -473,7 +473,7 @@ var/list/preferences_datums = list()
 
 	character.headset_choice = headset_choice
 
-	if(length(psionics) && character.client)
+	if(length(psionics))
 		for(var/power in psionics)
 			var/singleton/psionic_power/P = GET_SINGLETON(text2path(power))
 			if(istype(P) && (P.ability_flags & PSI_FLAG_CANON))