Update _quirk.dm (#22618)

Author: ToasterBiome

code/datums/traits/_quirk.dm

@@ -27,7 +27,8 @@
 		qdel(src)
 	quirk_holder = quirk_mob
 	SSquirks.quirk_objects += src
-	to_chat(quirk_holder, gain_text)
+	if(gain_text)
+		to_chat(quirk_holder, gain_text)
 	quirk_holder.roundstart_quirks += src
 	if(mob_trait)
 		ADD_TRAIT(quirk_holder, mob_trait, ROUNDSTART_TRAIT)